Bremness, Lesley
Dorling Kindersley, 1988
Buku Teks
Barnard, Julian
Ashgrove Press, 1988
Buku Referensi
Harvey, Clare G.
Thorsons, 1995
Buku Referensi
Diekelmann, John
New York: McGraw-Hill, 1982
Buku Teks
Diekelmann, John
New York: McGraw-Hill, 1982
Buku Teks