Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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