Martindale, C. C. (1937). The difficult commandment: Notes on self-control especially for young men (9th ed.). P.J. Kennedy & Sons.
Lua i Stíl Chicago (17ú heag.)Martindale, C. C. The Difficult Commandment: Notes on Self-control Especially for Young Men. 9th ed. New York: P.J. Kennedy & Sons, 1937.
Lua MLA (8ú heag.)Martindale, C. C. The Difficult Commandment: Notes on Self-control Especially for Young Men. 9th ed. P.J. Kennedy & Sons, 1937.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.