APA (7th ed.) Citation

Ferguson, M. C. (1931). Botanical problem. Science, 73, 193. https://doi.org/10.1126/science.73.1886.193

Chicago Style (17th ed.) Citation

Ferguson, M. C. "Botanical Problem." Science 73 (1931): 193. https://doi.org/10.1126/science.73.1886.193.

MLA (9th ed.) Citation

Ferguson, M. C. "Botanical Problem." Science, vol. 73, 1931, p. 193, https://doi.org/10.1126/science.73.1886.193.

Warning: These citations may not always be 100% accurate.