Paul M. Camic, Jean E. Rhodes, Lucy Yardley
APA, 2007
Buku Teks
Lewis, Michele K.
[Springer, ], 2012
eBooks
edited by Pieter J.D. Drenth, Joseph A. Sergeant, Roelf J. Takens
John Wiley & Sons, 1990
Buku Teks
Alloy, Lauren B.
McGraw-Hill , 1999
Buku Teks
Feist, Gregory J.
McGraw-Hill, 2012
Buku Teks