Witold Hurewicz - Personal Reminiscences

Samuel Eilenberg in:

"Collected works of Witold Hurewicz."
Edited by Krystyna Kuperberg. With contributions by Ryszard Engelking, Roman Pol, Edward Fadell, Solomon Lefschetz and Samuel Eilenberg.
American Mathematical Society, Providence, RI, 1995. pp. XIV–XIVI