Cita APA (7a ed.)

Preece, W. H. A. (1937). North American rock plants. The MacMillan co..

Cita Chicago Style (17a ed.)

Preece, W. H. A. North American Rock Plants. New York: The MacMillan co., 1937.

Cita MLA (9a ed.)

Preece, W. H. A. North American Rock Plants. The MacMillan co., 1937.