APA (7th ed.) Citation

International Congress on Photobiology Copenhagen, Christensen, B. C., & Buchmann, B. (1961). Progress in photobiology: Proceedings. Elsevier Pub. Co..

Chicago Style (17th ed.) Citation

International Congress on Photobiology Copenhagen, Brge Christian Christensen, and B. Buchmann. Progress in Photobiology: Proceedings. Amsterdam, New York: Elsevier Pub. Co., 1961.

MLA (9th ed.) Citation

International Congress on Photobiology Copenhagen, et al. Progress in Photobiology: Proceedings. Elsevier Pub. Co., 1961.