Doby, J. T. (1967). An introduction to social research (2d ed.). Appleton Century-Crofts.
Lua i Stíl Chicago (17ú heag.)Doby, J. T. An Introduction to Social Research. 2d ed. New York: Appleton Century-Crofts, 1967.
Lua MLA (8ú heag.)Doby, J. T. An Introduction to Social Research. 2d ed. Appleton Century-Crofts, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.