Kumar, Ranjit, author
SAGE, 2014
Buku Teks
Kumar, Ranjit, author
Sage Publications, 2005
Buku Teks
Watt, Roger, author
Sage, 2019
Buku Teks
Ziegler, Kathleen, author
Rockport Publishers, 1994
Buku Referensi
Reid, Stephen J.
Gordon and Breach Science Publishers, 2000
Buku Teks