Wallis, W. Allen, author
Free Press, 1956
Buku Teks
Wonnacott, Thomas H., 1935-, author
John Wiley & Son , 1969
Buku Teks
Hamburg, Morris, author
Harcourt Brace Jovanovick, 1985
Buku Teks
Furlong, Nancy E., author
Harcourt College Publishers, 2000
Buku Teks
Sobol, Marion Gross, author
McGraw-Hill , 1983
Buku Teks