Wurm, Jan, author
Birkhal'user, 2007
Buku Teks
Shand, E.B., author
McGraw-Hill, 1958
Buku Referensi
Dena K. Tarshis, author
L.h.selman LTD, 2001
Buku Teks
Rice, Peter
E & FN Spon, 1995
Buku Teks
McKenzie, Bertha, author
University of Sydney, 1989
Buku Referensi