Jacobsen, Kathyn
Jones & Bartlett Learning, 2012
Buku Teks
edited by Ann Bowling, Shah Ebrahim
Open University Press, 2007
Buku Teks
Baumgartner, Ted A.
McGraw Hil , 2013
Buku Teks
Baumgartner, Ted A.
McGraw-HIll, 2002
Buku Teks
Eko Budiarto
EGC, 2003
Buku Teks