Newman, William H., author
South-Western Publishing Company, 1976
Buku Teks
Steiner, George A. (George Albert), 1912-, author
Macmillan, 1977
Buku Teks
Glueck, William F., author
McGraw-Hill, 1984
Buku Teks
Steiner, George A. (George Albert), 1912-, author
Macmillan, 1977
Buku Teks
Glueck, William F., author
McGraw-Hill, 1980
Buku Teks