Guilford, J. P. (Joy Paul), 1897-1987, author
McGraw-Hill , 1978
Buku Teks
Gregory, Derek, author
McGraw-Hill , 1978
Buku Teks
Fleming, Michael C., author
Prentice-Hall, 1991
Buku Teks
Hamburg, Morris, author
Harcourt Brace Jovanovick, 1985
Buku Teks
Mills, Richard L., author
McGraw-Hill Kogakusha, 1977
Buku Teks