APA

Johnston M. C., Johnston L. V. A., . (1978). Rhamnus. New York, New York, United States: The New York Botanical Garden.

Chicago

Johnston Marshall C, Johnston La Verne A, . 1978. Rhamnus. New York, New York, United States: The New York Botanical Garden.

Harvard

Johnston M. C., Johnston L. V. A., . (1978). Rhamnus. New York, New York, United States: The New York Botanical Garden.

MLA

Johnston Marshall C, Johnston La Verne A, . Rhamnus. New York, New York, United States: The New York Botanical Garden. 1978.