Purves, Alan C. (Alan Carroll), 1931-1996, author
Harcourt Brace Jovanovich, 1984
Buku Teks
Westwood, John, author
Gramedia, 2006
Buku Teks
Murray, Rowena
Open University Press, 2002
Buku Teks
Vallins, G.H.
Andrew Deutsch, 1952
Buku Teks
Reader's Digest Service, 1987
Buku Teks