edited by Gerald D. Berreeman; with the assistance of Kathleen M. Zaretsky
Academic Press, 1981
Buku Teks
edited by Peter M. Blau
Open Books, 1976
Buku Teks
Buchanan, Norman S., author
The Twentieth Country Fund , 1955
Buku Teks
DiFonzo, Nicholas, author
APA, 2007
Buku Teks
edited by John D. Montgomery, William J. Siffin
McGraw-Hill, 1966
Buku Teks