Other authors: Malcolm S. Adiseshiah (Contributor), Komla Agbetiafa (Contributor), Manzoor Ahmed (Contributor), Victor Bravo Ahuja (Contributor), Abdelwahad Bouhdiba (Contributor) — 18 more, Stewart Crysdale (Contributor), D. B. Elkonine (Contributor), Chena Hoffer (Contributor), A.M. Huberman (Contributor), Lê Thanh Khôi (Contributor), A. N. Leontiev (Contributor), Amadou-Mahtar M ' Bow (Contributor), Eberhard Mannschatz (Contributor), J. M. Mazaba (Contributor), Gaston Mialaret (Contributor), J. P. Naik (Contributor), E. Nthépé (Contributor), Anne-Marie Raimbault (Contributor), John A; Rex (Contributor), Fay E. Saunders (Contributor), Bogdan Suchodolski (Contributor), Ana Vasquez (Contributor), Fernando Volio (Contributor)