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
Griffiths, Brian
Praeger , 1972
Buku Teks SO
Meier, Gerald M.
Wiley, 1966
Buku Teks
Heady, Earl O.
Iowa State University Press, 1969
Buku Teks SO
edited by I. Livingstone
Penguin Books, 1971
Buku Teks SO