APA (7th ed.) Citation

Helsop-Harrison, J. (1956). New concepts in flowering-plant taxonomy. Harvard University Press.

Chicago Style (17th ed.) Citation

Helsop-Harrison, John. New Concepts in Flowering-plant Taxonomy. Cambridge: Harvard University Press, 1956.

MLA (9th ed.) Citation

Helsop-Harrison, John. New Concepts in Flowering-plant Taxonomy. Harvard University Press, 1956.