Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.