Tompkins, P., & Bird Christopher. (1973). The secret life of plants. Harper & Row Publishers.
Citazione stile Chigago Style (17a edizione)Tompkins, Peter, e Bird Christopher. The Secret Life of Plants. New York: Harper & Row Publishers, 1973.
Citatione MLA (9a ed.)Tompkins, Peter, e Bird Christopher. The Secret Life of Plants. Harper & Row Publishers, 1973.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.