edited by Mary Cherian and Rosalind Y. Mau
McGrow-Hill, , 2003
Buku Teks
McKay, Sandra Lee, author
Routledge, 2016
Buku Teks
SEAMEO, 2016
Buku Teks
Christensen, Kit R., author
McGraw-Hill, 2002
Buku Teks
Planet, Lonely, author
Lonely Planet, 2012
Buku Teks