Revesz, Richard L.
Oxford University Press , 1997
Buku Teks
Stewart, Richard B.
The Bobbs-Merrill Company,Inc., 1978
Buku Teks
Bonine, John E.
St. Paul, Minn, 1992
Buku Teks
Yingyi, Situ, author
Sage Publications, 2000
Buku Teks
Schwartz, Mortimer D., author
Gale Research, 1977
Buku Teks