Loh, Alvin, author
Marshall Cavendish, 2012
Buku Teks
Warin, Cassandra, author
[publisher not identified], {s.a.]
Buku Referensi
World Express Mapping Sdn. Bhd, [date of publication not identified]
Buku Referensi
Nasution, Khoo Salma, author
Marshall Cavendish Editions, 2009
Buku Referensi
Warin, Cassandra, author
MPH Group Publishing Sdn Bhd, 2003
Buku Teks