Sherman, Andrew J.
American Management Association, 2006
eBooks
Jervis, F.R.
Routledge and Kegan Paul , 1971
Buku Teks
Weston, John Fred, 1916-
McGraw-Hill, 2001
Buku Teks SO
Partner, Simon
New Jersey, Prentice Hall1991,
Buku Referensi
Coyle, Brian
Canterbury CIB , 2000
Buku Teks