Packer, M. J. (2011). The science of qualitative research. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Packer, Martin J. The Science of Qualitative Research. New York: Cambridge University Press, 2011.
Lua MLA (9ú heag.)Packer, Martin J. The Science of Qualitative Research. Cambridge University Press, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.