Johnson, Carol, author
Allen and Unwin, 1989
Buku Teks
Zainah Anwar, author
Yayasan Mohamed Noah; Petaling Jaya, Selangor, Malaysia , 2011
Buku Referensi
Bailey, Cyril, author
Oxford University Press, 1951
Buku Teks
edited by Val Moses
Grayson Publishing, 2007
Buku Teks SO
Archer, Geoffrey
Arrow , 2002
Buku Teks