Costello, P. J. (2003). Action research. Continuum.
Lua i Stíl Chicago (17ú heag.)Costello, Patrick J.M. Action Research. London: Continuum, 2003.
Lua MLA (9ú heag.)Costello, Patrick J.M. Action Research. Continuum, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.