Sharp, Ansel M., author
McGraw-Hill, 2000
Buku Teks
Sharp, Ansel M., author
McGraw-Hill, 1998
Buku Teks
Coyle, Diane, author
Texere, 2002
Buku Teks
Frain, H. LaRue
Hougton Mifflin Company, 1937
Buku Teks
McKenzie, Richard B., author
McGraw-Hill, 1978
Buku Teks