Shapiro, Alan C.
John Wiley Sons, 1999
Buku Teks
James R. Hines, edited
The University of Chicago Press, 2001
Buku Teks
Eitman, David K., author
Perason, 2001
Buku Teks
Keegan, Warren J., author
Prentice-Hall, 1980
Buku Teks
Knickerbocker, Frederick T., author
Division of Research, Graduate School of Business Administration, Harvard University, 1973
Buku Teks