The workers of Namibia / Gillian Cronje, Suzanne Cronje. - London: IDAF, 1979. - 134 p. This report is based on material prepared for the Anti-Slavery society and submitted by them in 1977 to the third session of the working group of experts on slavery of the United Nations sub-commission on prevention of discrimination and protection of minorities. ISBN: 0-904759-27-X
