Deloitte Touche Tohmatso limited
Deloitte Touche Tohmatso limited, 2010
Buku Referensi
Goubert, Pierre, author
Hazell Watson & Viney, 1969
Buku Teks
edited by Glenn Morgan, Richard Whitley
Oxford University Press, 2012
Buku Teks
McBride, John, author
BBC Books , 1996
Buku Teks
Baker, Stanley B., author
Prentince-Hall, 1996
Buku Teks