APA (7th ed.) Citation

Capone, D. G., & Carpenter, E. J. (1982). Nitrogen fixation in the marine environment. Science, 217, 1140.

Chicago Style (17th ed.) Citation

Capone, D. G., and E. J. Carpenter. "Nitrogen Fixation in the Marine Environment." Science 217 (1982): 1140.

MLA (9th ed.) Citation

Capone, D. G., and E. J. Carpenter. "Nitrogen Fixation in the Marine Environment." Science, vol. 217, 1982, p. 1140.