Davis, John
Gramedia Pustaka Utama, 1997
Buku Teks
Davis, Edwin G.
Macmillan/McGraw-Hill, 1991
Buku Teks
Ficker, Victor B., author
Charles E. Merrill, 1975
Buku Teks
Becker, Brian E., author
Erlangga, 2009
Buku Teks
Maddux, Robert B., author
Erlangga, 2001
Buku Teks