Eide, Arvid R., author
McGraw-Hill, Boston: McGraw-Hill,
Buku Teks
Hargreaves, Martin
Longman, 1996
Buku Teks
Ian E. Thompson [and others]
Elsevier, 2006
Buku Teks
Wright, Paul H., author
Erlangga, 2002
Buku Teks
Wright, Paul H., author
Erlangga, 2002
Buku Teks