Jonathan Jacky
Cambridge university press, 2008
Buku Teks
Ashley, Nicholas, author
McGraw-Hill, 1995
Buku Teks
Ince, D. (Darrel), author
McGraw-Hill, 1995
Buku Teks
Glass, Robert L., author
Prentice-Hall, 1992
Buku Teks
Ebenau, Robert G., author
McGraw-Hill, 1994
Buku Teks