APA

Erdos R. F., Clark J. H., . (1971). Correspondence courses for in-service teacher training at primary level in developing countries: report of a meeting of International Experts, Hamburg, September 1970. Hamburg: Unesco Institute for Education.

Chicago

Erdos Renée F, Clark John H, . 1971. Correspondence courses for in-service teacher training at primary level in developing countries: report of a meeting of International Experts, Hamburg, September 1970. Hamburg: Unesco Institute for Education.

Harvard

Erdos R. F., Clark J. H., . (1971). Correspondence courses for in-service teacher training at primary level in developing countries: report of a meeting of International Experts, Hamburg, September 1970. Hamburg: Unesco Institute for Education.

MLA

Erdos Renée F, Clark John H, . Correspondence courses for in-service teacher training at primary level in developing countries: report of a meeting of International Experts, Hamburg, September 1970. Hamburg: Unesco Institute for Education. 1971.