Chew, David B. H.
Printers and Converters Ltd., 1973
Buku Teks
Rockefeller, David
McGraw-Hill , 1964
Buku Teks
Rodgers, Raymond, author
Alexander Hamiltion Institute, 1962
Buku Teks
Hopper, Melvyn A.
Eurasia Media, 1985
Buku Teks
Hopper, Melvyn A.
Eurasia Media, 1985
Buku Teks