Johnson, Keith, author
Blackwell , 2008
Buku Teks
Floud, Roderick
Princeton University Press, 1973
Buku Teks
Paik, C. M., 1931-, author
McGraw-Hill, 1973
Buku Teks
Johnson, Ross H., author
Houghton Miffiln, 1976
Buku Teks
Bell, Collin E., author
Richard D. Irwin, [date of publication not identified]
Buku Teks