Lorayne, Harry
Golden Books Centre SDN. BDN, 1992
Buku Teks
Schwartz, Barry, author
W.W. Norton, 1991
Buku Teks
Stine, Jean Marie, author
Pustaka Delapratasa, 2001
Buku Teks
Howes, Mary B., author
Academic Press, 2014
eBooks
Parkin, Alan C., author
John Wiley & Sons, 1999
Buku Teks