Herskovits, Melville J. (Melville Jean), 1895-1963, author
Alfred A. Knopf, 1952
Buku Teks
Pleck, Elizabeth H., author
Prentice-Hall, 1980
Buku Teks
Strecker, Edward A.
Macmillan, 1966
Buku Teks
Ouspensky, P.D.
Hodder and Stoughton, 1957
Buku Teks
May, Rollo, 1909-, author
Dell Publishing Co., Inc., 1953
Buku Teks