Balekjian, W.H.
Oceana Publications, Inc., 1967
Buku Teks
Haslam, S. M. (Sylvia Mary), 1934-
Cambridge University Press, 2014
Buku Teks
Phinnemore, David
Routledge, Taylor & Francis Group, 2008
Buku Referensi
Bergmans, Bernhard
Graham and Trotman, 1991
Buku Teks
edited by R.M. Whiteside
Graham and Trotman, 1988
Buku Referensi