APA (7th ed.) Citation

Johnson, A. T., & Smith, H. A. (1951). Plant names simplified ([Second revised edition].). W. H. & L. Collingridge.

Chicago Style (17th ed.) Citation

Johnson, A. T., and H. A. Smith. Plant Names Simplified. [Second revised edition]. London: W. H. & L. Collingridge, 1951.

MLA (9th ed.) Citation

Johnson, A. T., and H. A. Smith. Plant Names Simplified. [Second revised edition]. W. H. & L. Collingridge, 1951.