Strong, C.F.
Sidgwick & Jackson Limited, 1960
Buku Teks
Strong, C.F.
Nuansa, 2004
Buku Teks
Dahl, Robert A., 1915-2014
Prentice Hall of India, 1976
Buku Teks
Dahl, Robert A., 1915-2014
Prentice-Hall, 1978
Buku Teks
MacIver, Robert M.
Oxford, 1926
Buku Teks