Crabbe, Ernest H., author
South-Western Publishing, 1961
Buku Teks
Crabbe, Ernest H., author
South-Western Publishing, 1951
Buku Teks
Nickels, William G., author
McGraw-Hill, 2008
Buku Teks
Stanwick, Peter A., author
Pearson, 2009
Buku Teks
Conover, Hobart H.
Allyn and Bacon, 1977
Buku Teks