Cita APA (7a ed.)

Nicholas, D., & Egan, A. R. (1975). Trace elements in soil-plant-animal systems. Academic Press.

Cita Chicago Style (17a ed.)

Nicholas, D.J.D, y Adrian R. Egan. Trace Elements in Soil-plant-animal Systems. New York: Academic Press, 1975.

Cita MLA (8a ed.)

Nicholas, D.J.D, y Adrian R. Egan. Trace Elements in Soil-plant-animal Systems. Academic Press, 1975.