Darwin, C., Henslow, J. S., & Barlow, N. (1967). Darwin and Henslow, the growth of an idea : letters 1831-1860 / edited by Nora Barlow: Letters 1831-1860. Murray.
Chicago Style (17th ed.) CitationDarwin, Charles, John Stevens Henslow, and Nora Barlow. Darwin and Henslow, the Growth of an Idea : Letters 1831-1860 / Edited by Nora Barlow: Letters 1831-1860. London: Murray, 1967.
MLA (9th ed.) CitationDarwin, Charles, et al. Darwin and Henslow, the Growth of an Idea : Letters 1831-1860 / Edited by Nora Barlow: Letters 1831-1860. Murray, 1967.
Warning: These citations may not always be 100% accurate.