Taylor, Julie D., author
Rockport Publishers, 2002
Buku Teks
Taylor, Andrew, author
University of Queensland Press, 1971
Buku Teks
Brush, Don O., author
McGraw-Hill, 1975
Buku Teks
Gjelsvik, Atle, author
John Wiley & Sons, 1981
Buku Teks
McGraw-Hill, 1960
Buku Teks