APA (7e ed.) Bronvermelding

CROCKETT, J. U., & THE EDITOR OF TIME-LIFE BOOK. (1977). Perennial: (the time-life encyclopaedia of gardening). Time-Life Books.

Chicago (17e ed.) Bronvermelding

CROCKETT, James Underwood, en THE EDITOR OF TIME-LIFE BOOK. Perennial: (the Time-life Encyclopaedia of Gardening). Alexandria: Time-Life Books, 1977.

MLA (9e ed.) Bronvermelding

CROCKETT, James Underwood, en THE EDITOR OF TIME-LIFE BOOK. Perennial: (the Time-life Encyclopaedia of Gardening). Time-Life Books, 1977.