APA Alıntı

Preston, R. J. (1961). North American trees (2nd ed.). Iowa State University press.

Chicago Stili Alıntı

Preston, Richard J. North American Trees. 2nd ed. Iowa: Iowa State University press, 1961.

MLA Alıntı

Preston, Richard J. North American Trees. 2nd ed. Iowa State University press, 1961.