[1] P. Working Party on the Textbook for Economics in Africa and International Economic Association and D. Walker, "Additional note on the elaboration of a textbook of economics for Africa ," 1962.

Working Party on the Textbook for Economics in Africa, Paris, 1962 and International Economic Association and Walker, David A., "Additional note on the elaboration of a textbook of economics for Africa ," 1962.

Working Party on the Textbook for Economics in Africa, P., International Economic Association, Walker, D., (1962). "Additional note on the elaboration of a textbook of economics for Africa,"

Working Party on the Textbook for Economics in Africa, Paris, 1962, International Economic Association, Walker, David A.. (1962). "Additional note on the elaboration of a textbook of economics for Africa,"