Shafer, C. (1985). Excellence in teaching with the seven laws: A contemporary abridgment of Gregory's seven laws of teaching. Baker.
Lua i Stíl Chicago (17ú heag.)Shafer, Carl. Excellence in Teaching with the Seven Laws: A Contemporary Abridgment of Gregory's Seven Laws of Teaching. Grand Rapids: Baker, 1985.
Lua MLA (9ú heag.)Shafer, Carl. Excellence in Teaching with the Seven Laws: A Contemporary Abridgment of Gregory's Seven Laws of Teaching. Baker, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.