Mc Graw Hill, 1996
Buku Teks
Victoria University of Washington, 1982
Buku Teks
Holt, Rinehart and Winston, 1990
Buku Teks SO
Edwards, Heather M., 1947-, author
Scarecrow Press, 1990
Buku Teks
edited by Neil Appleton
Design Media Publishing, 2013
Buku Referensi