Iqbal, Zamir, author
John Wiley & Sons, 2011
Buku Teks
Abdul Rahim Abdul Rahman, author
CERT Publications Sdn. Bhd, 2010
Buku Teks
Visser, Hans G., author
Edward Elgar, 2009
Buku Teks
Prest, A.R., author
English Language Book Society, 1974
Buku Teks
Musgrave, Richard A., author
McGraw-Hill, 1983
Buku Teks