Dickinson, Leslie
Cambridge University Press , 1988
Buku Teks
Hilburn, John L., 1938-, author
McGraw-Hill, 1983
Buku Teks
Hilburn, John L., 1938-, author
McGraw-Hill, 1983
Buku Referensi
Cracolice, Mark S., author
Thomson, Brooks/Cole, 2007
Buku Teks
Clarke, D.A., author
DP Pub., 1994
Buku Teks