Feiring, Bruce R., author
Sage University Paper, 1986
Buku Teks
Kim, Chaiho, author
Rinehart and Winston, 1971
Buku Teks
Campbell, Hugh G., author
Prentice-Hall, 1977
Buku Teks
Thie, Paul R., author
John Wiley & Sons, 1979
Buku Teks
Hellwig, Jessica
Columbia University Press, 1969
Buku Teks