Hart, Andrew, author
Routledge, 1997
Buku Referensi
Holsinger, Ralph L., author
McGraw-Hill, 1994
Buku Teks
Hulsey, Nathan, author
Emerald Publishing Limited, 2020
eBooks
edited by David Lusted
Routledge, 1991
Buku Referensi
Teo, Yi-Ling, author
Sweet & Maxwell Asia, 2011
Buku Teks