Singh, Awther
Law Book Company of Singapore, 1974
Buku Teks
Thornton, Richard C., author
Sweet & Maxwell, 2012
Buku Teks
Gunadi, author
[publisher not identified], 2001
Buku Teks
technical editors, Pok Soy Yoong, Ng Keat Seng, Steven M. Timms
Lexis Nexis, 2011
Buku Referensi
Prentice-Hall, 1976
Buku Teks