Palvia, Chand Mal
Institute of Social Studies, 1953
Buku Teks
Thirlwall, Anthony Philip, author
English Language Book Society, 1978
Buku Teks
Batten,T.R., author
Oxford University Press, 1960
Buku Teks
Sie, Kwat Soen
Centre for Agricultural Publications and Documentation, 1968
Buku Teks
Mackintosh, A.S.
Cambridge University Press , 1963
Buku Teks