Krevitsky, Nik, author
Reinhold Book, 1964
Buku Teks
Hatcher, Jeffrey, author
Story Press, 1996
Buku Teks
Shannon, Faith, author
Reed International Books, 1987
Buku Referensi
Landau, Sidney I., author
Cambridge University Press, 2001
Buku Referensi
Kitley, Philip, author
Darling Downs Institute Press, 1986
Buku Referensi