Rummel, R. J. (1970). Applied factor analysis. Northwestern University Press.
Lua i Stíl Chicago (17ú heag.)Rummel, Rudolph J. Applied Factor Analysis. Evanston: Northwestern University Press, 1970.
Lua MLA (9ú heag.)Rummel, Rudolph J. Applied Factor Analysis. Northwestern University Press, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.