Ethridge, Marcus E., author
Wadsworth, 2010
Buku Teks
Lipson, Leslie, author
Prentice-Hall, 1954
Buku Teks
Ranney, Austin, author
Holt, Rinehart and Winston , 1958
Buku Teks
Lipson, Leslie, author
Prentice-Hall, 1965
Buku Teks
Ranney, Austin
Prentice Hal, 1993
Buku Teks