Filley, Alan C., author
Scott, Foresman, 1969
Buku Teks
Sayles, Leonard R., author
McGraw-Hill , 1964
Buku Teks
Porter, Donald E., author
International , 1964
Buku Teks
Lundgren, Earl F., author
Confield, 1974
Buku Teks
Moorhead, Gregory, author
South-Western Cengage Learning, 2012
Buku Teks