Radford, K.J., author
Phoenix Press, 1981
Buku Teks
Raven press, 1983
Buku Teks
Husted, Gladys L., author
Mosby Year Book, 1989
Buku Teks
edited by Randy Y. Hirokawa and Marshall Scott Poole
Sage, 1986
Buku Teks
Blair, Roger D., author
McGraw-Hill, 1987
Buku Teks