Nanney, J. Louis, author
Allyn and Bacon, 1980
Buku Teks
Engelsohn, Harold S.
McGraw-Hill, 1981
Buku Teks
Moyer, Robert E., author
McGraw-Hill, 2009
Buku Teks
Ballou, Ronald H., author
Ginn, 1943
Buku Teks
Bauer, George N., author
D.C. Heath, 1932
Buku Teks