Woody, Robert Henley
Jossey-Bass, 1989
Buku Teks
Seedhouse, David
Sage Publications, 2019
eBooks
Gillam, Tony
Palgrave Macmillan, 2018
Buku Teks
Clinton, Michael
Sydney Prentice Hall 1996 ,
Buku Teks
edited by Karen M Finello
Jossey-Bass, 2005
Buku Teks