Apps, Jerold W., author
Jossey-Bass , 1985
Buku Teks
Yogyakarta : 1990,
Buku Referensi
Humble, John William, author
McGraw-Hill, 1968
Buku Teks
Humble, John William, author
Pan Books, 1972
Buku Teks
edited by Peter Scheuermann
Academic Press, 1982
Buku Teks