Crow, James F., author
W.H. Freeeman , 1986
Buku Teks
Wallace, Bruce, 1920-, author
Columbia University Press, 1981
Buku Teks
Zahirunisa Abd Rahim, author
UMT, 2017
Artikel Jurnal
Frankham, Richard, author
Oxford University Press, 2017
eBooks
Artikel Jurnal