Guenther, Herbert V.
Shambhala, 1976
Buku Teks SO
Way, Lawrence W.
California Lange Medical Publ., 1983
Buku Teks SO
Russ, Sandra W
Lawrence Erlbaum Assossiate, 2004
Buku Teks SO
Maier, Henry W
Harper and Row, 1978
Buku Teks SO
Little, Brown and Co., 1959
Buku Teks