Ford, Michael Curtis, author
Orion, 2001
Buku Teks
edited by Wilbur Schramm
University of Illinois Press , 1960
Buku Teks
by Aleksey Maksimovich Gor`kiy; translated by Margaret Wettlin
Foreign Languages Publishing House, [date of publication not identified]
Buku Teks
Artikel Jurnal
Greene, Jay E.
New York Washington Square Press 1967
Buku Teks