Blake, Robert R.
Texas Gulf, 1961
Buku Teks
Thomas N. Ingram...[et al.]
Harcourt College Publishers, 2001
Buku Teks
edited by Anthony G. McGrew
Manchester University Press, 1985
Buku Teks
Havidh Nazif
2016
UI - Disertasi (Membership)
Parsons, Robert
Harper & Row, 1974
Buku Teks