TRAVERS, R. M. (1969). An introduction to educational research.-- ed.3. The MacMillan Company.
Lua i Stíl Chicago (17ú heag.)TRAVERS, Robert M.W. An Introduction to Educational Research.-- Ed.3. New York: The MacMillan Company, 1969.
Lua MLA (9ú heag.)TRAVERS, Robert M.W. An Introduction to Educational Research.-- Ed.3. The MacMillan Company, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.