Cambridge University Press, 2018
eBooks
Galbraith, John Kenneth, 1908-2006, author
Harvard University Press, 1962
Buku Teks
Colborn, J.G., author
University of Hawaii Press, 1975
Buku Teks
edited by Larry W. Bowman and Ian Clark
Westview Press, 1981
Buku Teks
compiled by CENDIT (Centre for Development of Instructional Technology); with the assistance of CAPART (Council for Advancement of People's Action and Rural Technology)
Sage, 1989
Buku Teks