Habig, M. A. (1959). Heart o' the Rule: A primer for tertiary novices (Rev. ed.). Franciscan Herald Press.
Lua i Stíl Chicago (17ú heag.)Habig, Marion Alphonse. Heart O' the Rule: A Primer for Tertiary Novices. Rev. ed. Chicago: Franciscan Herald Press, 1959.
Lua MLA (8ú heag.)Habig, Marion Alphonse. Heart O' the Rule: A Primer for Tertiary Novices. Rev. ed. Franciscan Herald Press, 1959.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.