Miller, Delbert C.
Harper & Row, 1964
Buku Teks
Bierstedt, Robert, author
McGraw-Hill, 1974
Buku Teks
Susser, Mervyn W.
Oxford University Press, 1985
Buku Teks
Goode, William J., author
Bina Aksara, 1983
Buku Teks
Michelson, William, author
Addison-Wesley Publishing , 1970
Buku Teks