Lucas, jo Desha
The Foundation Press, Inc., 1978
Buku Teks SO
Healy, Nicholas J.
[Publisher not identified], 1986
Buku Teks SO
David W Robertson ... [et al.]
Thomson/West, 2011
Buku Teks
Gorman, Robert A., 1937-
Michie Co., 1993
Buku Teks
edited by S.M. Waddams
University of Toronto Press, 1971
Buku Teks SO