Bormann, Ernest G., author
Burgess Publishing, 1972
Buku Teks
Galanes, Gloria J., author
McGraw-Hill, 2013
Buku Teks
Gulley, Halbert E., author
Holt, Rinehart and Winston, 1977
Buku Teks
Luft, Joseph, author
National Press Books, 1970
Buku Teks
Luft, Joseph, author
Mayfield Publishing Company, 1984
Buku Teks