Hays, William L., author
Harcourt Brace Colege, 1994
Buku Teks
McClave, James T., author
Dellen Publishing, 1985
Buku Teks
McClave, James T., author
Pearson, 2017
Buku Teks
McClave, James T., author
Prentice-Hall, 2000
Buku Teks
Hays, William L. (William Lee), 1926-1995, author
Holt, Rinehart and Winston, 1971
Buku Teks