Ramage, Janet, 1932-, author
Oxford University Press, 1983
Buku Teks
Hecht, Jeff, author
McGrawHill, 1986
Buku Referensi
Mackie, Raymond K., author
Longman Scientific & Technical, 1990
Buku Teks
Harmon, Sharon Koomen, author
John Wiley & Sons, 2001
Buku Referensi
Scott, Foresman and Company, 1984
Buku Teks