Sherman, Andrew J.
American Management Association, 2006
eBooks
Weston, J. Fred [John Fred], 1916-
McGraw-Hill, 2001
Buku Teks SO
Partner, Simon
New Jersey, Prentice-Hall1991,
Buku Referensi
Coyle, Brian
Canterbury CIB , 2000
Buku Teks
Gaughan, Patrick A.
John Wiley & Sons, 2002
Buku Teks SO