First steps toward space;
proceedings of the first and second History Symposia of the International Academy of Astronautics at Belgrade, Yugoslavia, 26 September 1967, and New York, U.S.A., 16 October 1968.
Edited by Frederick C. Durant III and George S. James.

APA Citation

History Symposium of the International Academy of Astronautics ((1st : : 1967 : : Belgrade, S., Durant, F. C., James, G. S., International Academy of Astronautics., History Symposium of the International Academy of Astronautics ((2nd : : 1968 : : New York, N. (1974). First steps toward space: proceedings of the first and second History Symposia of the International Academy of Astronautics at Belgrade, Yugoslavia, 26 September 1967, and New York, U.S.A., 16 October 1968. Washington: Smithsonian Institution Press; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.].

MLA Citation

History Symposium of the International Academy of Astronautics ((2nd : : 1968 : : New York, N, et al.. First Steps Toward Space: Proceedings of the First And Second History Symposia of the International Academy of Astronautics At Belgrade, Yugoslavia, 26 September 1967, And New York, U.S.A., 16 October 1968. Washington: Smithsonian Institution Press; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1974.

Warning: These citations may not always be complete (especially for serials).