Relethford, John., author
McGraw-Hill Humanities, 2013
Buku Teks
Bloom, Lois
New York John Wiley & Sons 1978
Buku Teks
Cook, Guy (Guy W. D.), author
Oxford University Press, 2000
Buku Teks
San Diego : Sosiological Abstracts Inc.
Majalah, Jurnal, Buletin
edited by Albert H. Marckwardt
National Council of Teachers of English, 1968
Buku Teks