Physical rehabilitation of the injured athlete
edited by James R. Andrews, Gary L. Harrelson
W.B. Saunders, 1991
 Buku Referensi
Andrews, James R.
Physical rehabilitation of the injured athlete
Elsevier Saunder, 2012
 Buku Teks SO
Scott, David L.
Understanding and managing investment risk & return / David L. Scott.
Probus Publishing Company, 1990
 Buku Teks
Berman, Jeff
Maximizing project value: defining, managing, and measuring for optimal return
American Management Association, 2007
 eBooks
Cohen, David
The development of play
Routledge, 2006
 Buku Teks SO