APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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