Vollmann, Thomas E.
Addison-Wesley, 1973
Buku Teks
Kotler, Philip
Holt, Rinehart and Winston , 1971
Buku Teks
William, H.P.
John Wiley & Sons, 1978
Buku Teks
Collis, David J.
McGraw-Hill, 1998
Buku Teks
Victor Imanuel Nalle
Faculty of Law University of Indonesia, 2015
Artikel Jurnal