APA (7th ed.) Citation

Darwin, C., Barrett, P. H., & Freeman, R. B. (1986). Journal of researches, 2. Pickering.

Chicago Style (17th ed.) Citation

Darwin, Charles, Paul H. Barrett, and R. B. Freeman. Journal of Researches, 2. London: Pickering, 1986.

MLA (8th ed.) Citation

Darwin, Charles, et al. Journal of Researches, 2. Pickering, 1986.