Chandra, Prakash
Vikas Publishing House, 1982
Buku Teks
Chandra, Prakash
Vikas Publishing House, 1982
Buku Teks
Holsti, Kalevi J.
Prentice-Hall, 1977
Buku Teks SO
Jahn, Egbert
Springer-Verlag , 2015
eBooks
Spero, Joan Edelman
Routledge , 1997
Buku Teks