The various contrivances by which orchids are fertilised by insects.

MLA

Darwin, Charles Robert. The Various Contrivances by Which Orchids Are Fertilised by Insects. Second edition, revised. London: John Murray, 1877.

APA

Darwin, C. Robert. (1877). The various contrivances by which orchids are fertilised by insects. Second edition, revised. London: John Murray.

Chicago

Darwin, Charles Robert, The Various Contrivances by Which Orchids Are Fertilised by Insects. Second edition, revised. London: John Murray, 1877.