Garvin, David A., author
McGraw-Hill, 2002
Buku Teks
Lowe, Julian
Philip Allan, 1980
Buku Teks
Piper, David Warren
The University of Queensland, 1993
Buku Teks
Collin, Roger R
CCH Australia, 1998
Buku Teks
Terry, George Robert, author
Richard D. Irwin, INC, 1958
Buku Teks