Borjas, George J., author
McGraw-Hill, 2010
Buku Teks
Morgan, Chester A., author
The Dorsey Press, 1962
Buku Teks
Reynolds, Lloyd G., author
Prentice-Hall, 1998
Buku Teks
Reynolds, Lloyd G., author
Prentice-Hall, 1982
Buku Teks
Reynolds, Lloyd G., author
Prentice-Hall, 1959
Buku Teks