Griffin, Ricky W.
Houghton Miffiln, 1990
Buku Teks
Johnson, Carol
Allen and Unwin, 1989
Buku Teks
Zainah Anwar
Yayasan Mohamed Noah; Petaling Jaya, Selangor, Malaysia , 2011
Buku Referensi
Griffin & George, 1968
Buku Teks
Humana Press, 1993
Buku Teks