Hampden, John
Penguin Books, 1939
Buku Teks
New, W.H.
Copp Clark Pitman, 1986
Buku Teks
Amanda Askew
Miles Kelly, 2011
Buku Teks
Benton, Peter
Hodder and Stoughton Educational, 1994
Buku Teks
Karina Bahrin, Sharon Bakar, Bernice Chauly, Damyanti Ghosh
MPH Group, 2011
Buku Teks