Delamont, Sara
Falmer Press, 2000
Buku Teks
Stucki, Curtis W.
New York : Cornell University, 1970,
Buku Referensi
Aquila, author
Program Pascasarjana Universitas Indonesia, 2012
UI - Tesis (Open)
George E. Walker ... [and others]
Jossey-Bass, 2008
Buku Teks
Maureen Ryan
Sense, 2012
eBooks