Sikich, Geary W., author
McGraw-Hill, 1996
Buku Referensi
edited by Nancy Loudon
Churchill Livingstone, 1991
Buku Referensi
edited by John D. Edwards
Prentice-Hall, 1992
Buku Referensi
Palmer, Doc, author
McGraw-Hill, 1999
Buku Referensi
edited by Rachel Weber and Randall Crane
Oxford University Press, 2012
Buku Teks