Ferre, John P., author
Charles E. Merrill Pub. Co., 1983
Buku Referensi
Roth, Audrey J., author
Wadsworth, 1995
Buku Teks
Mahmoud, Shah, author
Betterway, 1992
Buku Referensi
Meyer, Michael, author
Little, Brown, 1982
Buku Teks
Churchill Livingstone, 2003
Buku Teks