Tan, Yin Toon
Oxford University Press, 1995
Buku Teks
by Edwin Mansfield [and others]
Macmillan, 1971
Buku Teks
Chicago : The University of Chicago Press
Majalah, Jurnal, Buletin
Cooper, Karyn
Springer, 2012
eBooks
edited by Paul H. Rosenthal, Russell K. Mish
Hayden Book , 1974
Buku Teks