Cuthbertson, Keith
The University of Michigan, 1992
Buku Teks
Gujarati, Damodar N., author
Salemba Empat, 2015
Buku Teks
Wooldridge, Jeffrey M., 1960-, author
South-Western College, 2000
Buku Teks
by George G. Judge [and others]
John Wiley & Sons, 1980
Buku Teks
Davidson, Russell, author
Oxford University Press, 1993
Buku Teks