Teodoro Rovito, Letterati e giornalisti italiani contemporanei. Napoli, Rovito, 1922 (p. 245):

…distinguished professor and publicist, …His bibliography is extraordinarily abundant and it would be impossible to provide a list here of all the publications of this prolific writer…

P.Z. Enrico Catellani. In Vita Libera, 25 giugno 1945:

In Padua, during the darkest days of the German occupation, the venerable Senator Enrico Catellani tragically died. He was a well-known figure in the city where he held the Chair of International Law at the University of Padova. He was a highly respected jurist with vast experience. Having lived for 89 years, he had a quick and vibrant intellect, was poised and supple in many works of his field and clear thinking. Those works focused on law were regular, the others were occasional, but they were all pervaded by his spirit of liberty and of human sociability, combined with a pleasing sense for things that were real, while at the same time with an intimate and scrupulous respect for ideal values. This could be seen in his daily interactions with colleagues and friends. His small stature then seemed to grow and his entire being would brighten with that smile which was almost always good-natured and never turned into resentment, except when it served to defend human dignity. The bonhomie could turn into indignation and his apparent docility was always combined with firm courage. He had written a book about the Italian-Austrian War of 1915-18 which was translated into several languages. He had also written thoughtfully about the League of Nations. His vision was wide and he maintained regular contact with the best of the French and English cultures, undoubtedly due to his knowledge of these languages. He criticised and condemned fascism, confirming his liberal beliefs at every opportunity. He was a Christian; although born into a Jewish family, he accepted the New Testament. He was nevertheless swept up by the mad and cruel Nazi politics which segregated him from the world of which he was so acutely fond and where he was considered with profound respect and much sincerity and sympathy. He was locked up in his private residence like in a prison, and this man who was so humane, so industrious and so fair found himself ostracised like a criminal. With a series of pretexts, his house was continuously looted and invaded. One day – in January 1945 – the silence of that violated home seemed as gloomy as a tomb to its neighbours. And those who went inside did indeed find the body of Signora Catellani and the senator in agony. In solitude, disease and decrepitude had consumed the noble lives of those who were held together by an intimate and constant accord. The German brutality had harassed them to the very end. He gave up his last breath on a hospital bed, confused among the poor. The pity was enormous and sorrowful of those few who knew. But we must speak of him again, of the jurist, the politician, the citizen, the man: speak of him properly. This fleeting gesture is not intended to be more than a first, modest act of reparation.
P.Z.

Amedeo Giannini, Ricordo di Enrico Catellani. In rivista di Studi politici internazionali, n1, 1949 (p. 62):

A graceful, agile and elegant writer, Catellani was a good, efficient and animated teacher. He knew how to engage his pupils with limpid and clear explanations, even of the most difficult problems…
He was devoted to friendships, to which he bore a simple expansiveness full of spontaneous cordiality and he rejoiced in being hospitable and to converse intimately, giving free rein to his spiritual restlessness full of vitality, even during the sad years which, in his late age, made his life bitter and disconsolate, and yet he endured this time with dignity and without complaint.

Giuseppe Toffanin Junior, Cent'anni in una città (schedario padovano). Padova, Rebellato, 1973 (p.63):

… Member of national and international commissions, among the first in Italy to initiate studies on law and on colonial law… He was a characteristic figure around Padua, and it was common to see him in the late afternoons in the Cittadella home on Via Dante where the Countess Luisa counted him among her dearest friends …

Giuseppe Toffanin, Primo Sinopico e l'Università di Padova, settantacinque anni fa. Padova, CEDAM, 1986:

… from here, for Sinopico, the inexhaustible series of blue, green, red, etc. books… (collections of diplomatic documents whose colour varied according to the country). For his austerity and fame, Catellani was also chief ornament at Padua’s finest gatherings.

Portrait of Enrico Catellani by Primo Sinopico, contained in: 
Sinopico e l’Università di Padova, Settantacinque anni fa. A cura di Giuseppe Toffanin, Padova, CEDAM, 1986