de Lange, Nicholas, author
Andromeda, 1992
Buku Referensi
Goodman, David G., author
Lexington Book, 2000
Buku Teks
Bamberger, David
New Jersey: Behrman House, 1979
Buku Teks
Hermawati, author
RajaGrafindo Persada, 2005
Buku Teks
Perowne, Stewart
Hodder and Stoughton, 1958
Buku Teks