Vol. 2 (1961), published by the S.A. Association for the Advancement of Knowledge and Culture. Vol. 3- published by the Foundation for Education, Science, and Technology. Vol. 4- published by the Foundation for Education, Science, and Technology, with the financial assistance of the Foundation for the Creative Arts.
Vol. 1 lacks vol. number. Vol. 2 undated.
Vol. 1-v. 3 in English; v. 4, Afrikaans or English. Articles in Afrikaans have summaries in English.
English or Afrikaans.