Cruickshank, Henry M., author
Richard D. Irwin, 1958
Buku Teks
David, Fred R., author
Pearson, 2009
Buku Teks
Velasquez, Manuel G., author
Pearson, 2006
Buku Teks
Hendrix, Jerry A, author
Wadsworth and Cengage Learning, 2007
Buku Teks
Schlesinger, Rudolf B.
The Foundation Press, 1950
Buku Teks