Fisher, B. Aubrey, 1937-, author
McGraw-Hill, 1980
Buku Teks
Fisher, B. Aubrey, 1937-, author
McGraw-Hill, 1990
Buku Teks
Ellis, Donald G., author
McGraw-Hill, 1994
Buku Teks
Artikel Jurnal
Bormann, Ernest G., author
Burgess Publishing, 1972
Buku Teks