Houghton Mifflin, 1967
Buku Teks
Pluijm, Ben A. van der
McGraw-Hill, 1977
Buku Teks
Owen, Claudia, author
Brooks/Cole Cengage Learning, 2010
Buku Teks
McConnell, David, author
McGraw-Hill, 2010
Buku Teks
Ramsey, William L., author
Holt, Rinehart and Winston, 1961
Buku Teks