Thompson, Chantal P.
D.C. heath and Company, 1996
Buku Teks
Crocker, Mary E. Coffman, author
Erlangga, 2005
Buku Teks
Heilenman, L. Kathy.
Harper & Row, [date of publication not identified]
Buku Teks
Evelyne Amon
McGraw-Hill Companies, 1996
Buku Teks
Bragger, Jeannette D.
Heinle & Heinle Pub, 1992
Buku Teks