APA (7e ed.) Bronvermelding

Não informado. (1933). Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania. University of Pennsylvania.

Chicago (17e ed.) Bronvermelding

Não informado. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania. Philadelphia, Pa: University of Pennsylvania, 1933.

MLA (8e ed.) Bronvermelding

Não informado. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania. University of Pennsylvania, 1933.

Let op: Deze citaties zijn niet altijd 100% accuraat.