technical editors, Pok Soy Yoong, Ng Keat Seng, Steven M. Timms
Lexis Nexis, 2011
Buku Referensi
Beattie, C. N., author
Stevens & Sons Lim. , 1957
Buku Teks
Stanley, Joyce, 1901-, author
Warren, Gorham and Lamont, 1971
Buku Teks
Shiau, Daren, author
LexisNexis, 2011
Buku Teks
Chew, Leslie, author
Lexis Nexis, 2010
Buku Teks