APA (7th ed.) Citation

Gilmour, J. S. L. (1947). Wild flowers of the Chalk. [Penguin Books].

Chicago Style (17th ed.) Citation

Gilmour, J. S. L. Wild Flowers of the Chalk. London, New York: [Penguin Books], 1947.

MLA (9th ed.) Citation

Gilmour, J. S. L. Wild Flowers of the Chalk. [Penguin Books], 1947.