Crockett, J. U. (1978). Plantes annuelles. Time-Life.
Cita Chicago (17th ed.)Crockett, James Underwood. Plantes Annuelles. Time-Life, 1978.
Cita MLA (9th ed.)Crockett, James Underwood. Plantes Annuelles. Time-Life, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.