Greenstein, Fred I., author
Englewood Cliffs, 1970
Buku Teks
Eisenberg, Melvin A., author
The Foundation Press, 1987
Buku Teks
Howard D.Samuel
Henry Holt and Company, 1953
Buku Teks
Ranlett, John G., author
John Wiley & Sons, 1969
Buku Teks
Ranlett, John G., author
John Wiley & Sons, 1969
Buku Teks