Hatcher, Jeffrey
Story Press, 1996
Buku Teks
Shannon, Faith
Reed International Books, 1987
Buku Referensi
Landau, Sidney I.
Cambridge University Press, 2001
Buku Referensi
Kitley, Philip
Darling Downs Institute Press, 1986
Buku Referensi
Alixim Gorky ... [and others]
Progress, 1972.
Buku Teks