International Clean Air Congress Washington, D.C., International Union of Air Pollution Prevention Associations, Englund, H. M., & Beery, W. T. (1971). Proceedings. Academic Press.

International Clean Air Congress Washington, D.C., International Union of Air Pollution Prevention Associations, H. M. Englund, and W. T. Beery. Proceedings. New York: Academic Press, 1971.

International Clean Air Congress Washington, D.C., et al. Proceedings. Academic Press, 1971.