APA (7th ed.) Citation

Johnston, I. M. (1929). Contributions from the Gray Herbarium of Harvard University. Harvard University.

Chicago Style (17th ed.) Citation

Johnston, Ivan M. Contributions from the Gray Herbarium of Harvard University. Cambridge: Harvard University, 1929.

MLA (9th ed.) Citation

Johnston, Ivan M. Contributions from the Gray Herbarium of Harvard University. Harvard University, 1929.