Robinson, James, 1943-
Delmar, 2011
Buku Teks SO
Anspaugh, David J.
McGraw-Hill, 1997
Buku Teks SO
edited by Robert J. Gatchel, Izabela Z. Schultz
Springer, 2012
eBooks
Corbin, Charles B.
McGraw Hil , 2013
Buku Teks SO
Charles B. Corbin, Gregory J. Welk, Ruth Lindsey, William R. Corbin
McGraw-Hill, 2004
Buku Teks SO