Cita APA

Briggs,D, & walters,s m. (1990). Plant variation and evolution. Cambridge University Press.

Citación estilo Chicago

Briggs,D, y walters,s m. Plant Variation and Evolution. United Kingdom: Cambridge University Press, 1990.

Cita MLA

Briggs,D, y walters,s m. Plant Variation and Evolution. Cambridge University Press, 1990.