edited by Robin E. J. Chater, Andrew Dean and Robet F. Elliott
Clarendom Press, 1981
Buku Teks
Victoria University of Washington, 1982
Buku Teks
Dalton, Hugh
Routledge & Kegan Paul Ltd , 1949
Buku Teks
Jetha, Nizar
Washington, D.C. World Bank 1980,
Buku Teks
Gracia-Garcia, Jorge
Washington, DC. World Bank, EAPRCD 1997,
Buku Teks