APA (7e ed.) Bronvermelding

Pennsylvania Horticultural Society. Yearbook of the Pennsylvania Horticultural Society. Pennsylvania Horticultural Society.

Chicago (17e ed.) Bronvermelding

Pennsylvania Horticultural Society. Yearbook of the Pennsylvania Horticultural Society. Philadelphia, Pa.: Pennsylvania Horticultural Society.

MLA (8e ed.) Bronvermelding

Pennsylvania Horticultural Society. Yearbook of the Pennsylvania Horticultural Society. Pennsylvania Horticultural Society.

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