Wonnacott, Paul, author
McGraw-Hill , 1979
Buku Teks
Wonnacott, Paul, author
John Wiley & Sons, 1990
Buku Teks
Albrecht, William P., author
Prentice-Hall, 1979
Buku Teks
edited by Nancy D. Ruggles
Prentice-Hall, 1970
Buku Teks
Meyers, Albert, author
Englewood Cliffs, 1956
Buku Klasik