edited by Helmut Gilnzler and Alex Williams
Wiley-VCH, 2001
Buku Referensi
Les Kane, editor
Gulf Publishing, 1987
Buku Referensi
Soisson, Harold E., author
John Wiley & Sons, 1975
Buku Teks
Ramey, Robert L.
Belmont: Wadsworth, 1963
Buku Teks
Prensky, Sol D.
Buku Teks