Hamid Jahankhani, David Libum Watson, Gianluigi Me, Frank Leonhardt, editor
World Scientific, 2010
Buku Referensi
McCarthy, N.K., author
McGraw-Hill, 2012
Buku Teks
Wallace, Michael, author
American Management Association, 2011
eBooks
U.S. Department of Health Human Services, 1988
Buku Teks
Levin, Richard B., author
Osborne McGraw-Hill, 1990
Buku Referensi