Meier, Gerald M., author
Oxford University Press, 1970
Buku Teks
Meier, Gerald M., author
Oxford University Press, 1965
Buku Teks
edited by Willy Sellekaerts
Macmillan, 1974
Buku Teks
Hettne, Bjorn 1939-
Longman Scientific & Technical , 1995
Buku Teks
World Bank
Oxford University Press, 1988
Buku Teks