Ahern, Holly
Lowa Wm.C. Brown Pub, 1992
Buku Teks
Hole, C.B., author
ELBS and Macmillan Education, 1997
Buku Teks
Kierszenbaum, Abraham L., author
Elsevier Saunder, 2012
Buku Teks
Mader, Sylvia S., author
Wm. C. Brown Publisher, 1993
Buku Teks
Johnson, Kenneth D., author
The Benjamin, 1984
Buku Teks