Hughes, Robert
Penguin Books, 1970
Buku Teks
Hauser, Arnold
Alfred A. Knopf , 1952
Buku Teks
Adams, Laurie Schneider
Brown & Benchmark , 1997
Buku Referensi
Honour, Hugh
Laurence King Publishing, 1995
Buku Referensi
Janson, H.W
Prentice-Hall, 1997
Buku Teks