McKenna, George, author
McGraw-Hill, 1998
Buku Teks
Geer, John Gray
Wadsworth and Cengage Learning, 2012
Buku Teks
Cummings, Milton C.
Harcourt Brace Jovanovich, 1981
Buku Teks
Cummings, Milton C.
Harcourt Brace Jovanovich, 1977
Buku Teks
Academy Group, 1987
Buku Teks