Butterworth, 1978
Buku Teks
Snape, John
Blacks stone press limited, 1999
Buku Teks
by Stanley S. Survey ... [and others]
Foundation Press, 1972
Buku Teks
Gifford, William C., author
Tax Management, 1974
Buku Teks
Postlewaite, Philip F., author
West Publisher, 1997
Buku Teks