edited by Norton Cinburg, Bruce Koppel and T.G. Mcgee
University of Hawaii Press, 1972
Buku Teks SO
Drake, St. Clair
Harper and Row, 1962
Buku Teks
Ferriss, Hugh
Dover Publications, 2005
Buku Teks SO
Wolfe, Gerard R.
McGraw-Hill, 1994
Buku Referensi
edited by Robert Moore Fisher
Doubleday, 1955
Buku Teks SO