Gates, Rose A.
Mosby Elsevier, 2008
Buku Teks SO
edited by Ken Haycock, Brooke E. Sheldon
Libraries Unlimited, 2008
Buku Teks SO
edited by Jacqueline L. Angel, Fernando Torres-Gil and Kyriakos Markides
Springer, 2012
eBooks
Moritz, Andreas
Welness Press, 2009
Buku Teks SO
Lowenthal, Mark M.
CQ Press, 2009
Buku Teks