Blackwelder, R. E. (1967). Taxonomy: A text and reference book. Wiley.
Lua i Stíl Chicago (17ú heag.)Blackwelder, Richard E. Taxonomy: A Text and Reference Book. New York: Wiley, 1967.
Lua MLA (9ú heag.)Blackwelder, Richard E. Taxonomy: A Text and Reference Book. Wiley, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.