Crocker, Walter R. (Walter Russell), 1902-, author
George Allen and Unwin, 1949
Buku Teks
Goshal, Kumar
Sheridan House Publisher, 1948
Buku Teks
Walker, E. A.
The University Press, 1945
Buku Teks
Kovac, Pavle
The Int. Labour Exhbition in Turn, 1961
Buku Teks
edited by Terence Emmons and Wayne S. Vucinich
Cambridge University Press, 2011
Buku Teks