edited by John I. Clarke
Pergamon Press, 1984
Buku Teks
Universitas Indonesia, 2003
UI - Tesis (Membership)
Andrews, Gavin J., 1970-, author
Routledge, Taylor & Francis Group, 2018
Buku Teks
Forde, C. Daryll
Methuen , 1956
Buku Teks
Thomson, J Oliver
JM Dent & Sons , 1961
Buku Teks