Lumb, R.D., author
Queensland University of Queensland Press, 1965
Buku Teks
Sugiyono, author
Alfabeta, 2007
Buku Teks
Dougal, W. Scott, author
Elsevier Saunder, 2012
Buku Teks
Sharma, Hari D.
John Wiley & Sons, 1994
Buku Teks
Lewis, Marcia A.
F.A. Davis Company, 2012
Buku Teks