Czinkota, Michael R.
The Dryden Press , 1996
Buku Teks
University of Melbourne ,
Majalah, Jurnal, Buletin
Griffin, Ricky W.
Addison-Wesley, 1995
Buku Teks
The Society of Business Administration, Kwansei Gakuin University, 2009
Majalah, Jurnal, Buletin
edited by Torben Juul Andersen
Emerald, 2017
eBooks