Hough, J. B., & Duncan, J. K. (1970). Teaching: Description and analysis. Addison-Wesley Pub.
Lua i Stíl Chicago (17ú heag.)Hough, John B., agus James K. Duncan. Teaching: Description and Analysis. Reading, Mass: Addison-Wesley Pub, 1970.
Lua MLA (9ú heag.)Hough, John B., agus James K. Duncan. Teaching: Description and Analysis. Addison-Wesley Pub, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.