Barnard, H. C. (1949). Principles and practice of geografhy teaching. University Tutorial Press.
Lua i Stíl Chicago (17ú heag.)Barnard, H. C. Principles and Practice of Geografhy Teaching. University Tutorial Press, 1949.
Lua MLA (8ú heag.)Barnard, H. C. Principles and Practice of Geografhy Teaching. University Tutorial Press, 1949.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.