edited by Cranley Onslow
Frederick A. Praeger, 1965
Buku Teks
Petri, Peter A., author
World Bank, 1993
Buku Teks
World Bank
Oxford University Press for the World Bank, 1993
Buku Teks
McGraw-Hill , 2000
Buku Teks
Singh, Lalita Prasad, author
University of Missouri Press, 1966
Buku Teks