Laird, Charlton Grant, 1901-
A Fawcett Premier Book, 1966
Buku Teks
Laird, Charlton Grant, 1901-
Fawcett World Library, 1957
Buku Teks
Whatmough, Joshua
The New American Library, 1956
Buku Teks
Psychology Press , 1999
Buku Teks
Kennedy, Dora, author
National Texbook, 1994
Buku Teks