Nebergall, William H., author
D.C. Heatd, 1972
Buku Teks
Ebbing, Darrell D., author
Brooks/Cole Cengage Learning, 2013
Buku Teks
Whitten, Kenneth W., author
Saunders College, 1992
Buku Teks
Umland, Jean B., author
St. Paul West, 1993
Buku Teks
Umland, Jean B., author
Brooks/Cole, 1999
Buku Teks