Merry, Malcolm
Butterworth, 1985
Buku Teks
Lesar, Hiram H., author
Little, Brown and Company, 1957
Buku Teks
Lo, Stefan H.C., author
McGraw-Hill, 2012
Buku Teks
Clewlow, Carol, author
Lonely Planet, 1989
Buku Referensi
Segal, Gerald, 1953-, author
St. Martin's Press, 1992
Buku Teks