Edited by William James
Anmol Publications PVT. LTD., 2005
Buku Teks
Henderson, Algo D., author
Unesco Paris, 1970
Buku Referensi
Newman, John Henry
J. M. Dent & Sons Ltd., 1956
Buku Teks
Otterspeer, Willem, author
Leiden University Press, 2008
Buku Teks
University Newcastle
The University of Newcastle, 1973
Buku Referensi