APA (7e ed.) Bronvermelding

Darwin, C., Barrett, P. H., & Freeman, R. B. (1989). The formation of vegetable mould through the action of worms with observations on their habits. Pickering.

Chicago (17e ed.) Bronvermelding

Darwin, Charles, Paul H. Barrett, en R. B. Freeman. The Formation of Vegetable Mould Through the Action of Worms with Observations on Their Habits. London: Pickering, 1989.

MLA (8e ed.) Bronvermelding

Darwin, Charles, et al. The Formation of Vegetable Mould Through the Action of Worms with Observations on Their Habits. Pickering, 1989.