Potter, K. D. (1999). Educators guide to finding resources in the public domain. Phi Delta Kappa Educational Foundation.
Lua i Stíl Chicago (17ú heag.)Potter, Kenyon David. Educators Guide to Finding Resources in the Public Domain. USA: Phi Delta Kappa Educational Foundation, 1999.
Lua MLA (9ú heag.)Potter, Kenyon David. Educators Guide to Finding Resources in the Public Domain. Phi Delta Kappa Educational Foundation, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.