Smallwood, M. E. (1929). A guide for the study of plants. D.C. Heath.
Lua i Stíl Chicago (17ú heag.)Smallwood, Mabel Elizabeth. A Guide for the Study of Plants. Boston: New York: D.C. Heath, 1929.
Lua MLA (8ú heag.)Smallwood, Mabel Elizabeth. A Guide for the Study of Plants. D.C. Heath, 1929.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.