Feld, barry c., author
Thomson/West, 2009
Buku Teks
David W. Springer, Albert R. Roberts, editor
Jones and Bartlett Publishers, 2011
Buku Teks
Sandhu, Harjit S.
Human Sciences Press, 1981
Buku Teks
Lawrence, Richard, author
Sage, 2008
Buku Teks
Eldefonso, Edward
John Wiley , 1983
Buku Teks