Allen & Unwin, 1950
Buku Teks
Hicks, Ursula K., author
Clarendon Press, 1961
Buku Teks
Fadel Muhammad, 1952-, author
Kompas Gramedia, 2008
Buku Teks
Cox, George, author
Thomson Learning, 2001
Buku Teks
Chester, Daniel Norman Sir
Macmillan, 1951
Buku Teks