Chew, David B. H.
Printers and Converters Ltd., 1973
Buku Teks
Hopper, Melvyn A.
Eurasia Media, 1985.
Buku Teks SO
Hopper, Melvyn A.
Eurasia Media, 1985
Buku Teks
Hopper, Melvyn A.
Eurasia Media, 1985
Buku Teks
Corbett, Jim
Cambridge University Press , 1990
Buku Teks