APA

Conference on Photoperiodism, . (1959). Photoperiodism and related phenomena in plants and animals. Washington, D.C: American Association for the Advancement of Science.

Chicago

Conference on Photoperiodism, . 1959. Photoperiodism and related phenomena in plants and animals. Washington, D.C: American Association for the Advancement of Science.

Harvard

Conference on Photoperiodism, . (1959). Photoperiodism and related phenomena in plants and animals. Washington, D.C: American Association for the Advancement of Science.

MLA

Conference on Photoperiodism, . Photoperiodism and related phenomena in plants and animals. Washington, D.C: American Association for the Advancement of Science. 1959.