Atkinson, Lloyd C., author
Richard D. Irwin, 1982
Buku Teks
Jones, J. Harry, author
Pitman, 1935
Buku Teks
McKenzie, Richard B., author
McGraw-Hill, 1980
Buku Teks
Addison-Wesley, 1985
Buku Teks
Ekelund, Robert B. Jr
Little, Brown & Co., 1986
Buku Teks