Carr, C. J. (Chris J.), author
Pitman, 1994
Buku Teks
J. Ralph Lindgren ... [et al.].
Thomson Wadsworth, 2005
Buku Teks
Peyton, Daniel
Blackstone Press limited, 1997
Buku Teks
by Barbara Allen Babcock [and others]
Little, Brown, 1975
Buku Teks
Lewis, David, author
IPM, 1994
Buku Teks