Hutchins, M. (1944). Introduction to reference work. American Library Association.
Lua i Stíl Chicago (17ú heag.)Hutchins, Margaret. Introduction to Reference Work. Chicago: American Library Association, 1944.
Lua MLA (9ú heag.)Hutchins, Margaret. Introduction to Reference Work. American Library Association, 1944.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.