Barr, Donald F.
Hasanuddin University, 1979
Buku Teks
Anderson, W.M. (Wendy M.), author
Wiley Publishing Australia Pty Ltd, 2013
Buku Teks
Departemen Pendidikan dan Kebudayaan, 1996
Buku Teks
Taylor and Francis , 2012
Buku Referensi
Schaefer, Charles E, author
The Guilford Press, 2016
Buku Teks