Lawrence, G. H. M. (1951). Taxonomy of vascular plants: By George H. M. Lawrence. The Macmillan.
Lua i Stíl Chicago (17ú heag.)Lawrence, George H. M. Taxonomy of Vascular Plants: By George H. M. Lawrence. New York: The Macmillan, 1951.
Lua MLA (9ú heag.)Lawrence, George H. M. Taxonomy of Vascular Plants: By George H. M. Lawrence. The Macmillan, 1951.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.