Perlmutter, Amos, author
Yale University Press, 1981
Buku Teks
Strong, C.F., author
Sidgwick & Jackson Limited, 1960
Buku Teks
Strong, C.F., author
Nuansa, 2004
Buku Teks
Dahl, Robert A., 1915-2014, author
Prentice-Hall, 1978
Buku Teks SO
Farley, John E., author
Prentice-Hall, 1987
Buku Teks