Vickery, Bertram George
Donnington Press, 1971
Buku Teks
Samuels, John M., author
McGraw-Hill, 1989
Buku Teks
Neuner, John J.W.
Richard D Irwin, Inc. , 1949
Buku Teks
Hermanson, Roger H., author
Irwin McGraw-Hill, 1998
Buku Teks
Barfield, Jesse T., author
South-Western Publishing, 2006
Buku Teks