Lunn, George
John Wiley & Sons, 1990
Buku Teks SO
Donzel, E. Van
E.J. Brill, 1994
Buku Referensi
New-York: Prentice Hall, 1993,
Buku Referensi
Heisler, Sanford I
John Wiley & Sons, 1984
Buku Referensi
edited by Andrew Heritage
Dorling Kindersley, 2000
Buku Referensi