Erickson, E. W. (1961). College and university library surveys, 1938-1952. American Library Association.
Lua i Stíl Chicago (17ú heag.)Erickson, E. Walfred. College and University Library Surveys, 1938-1952. Chicago: American Library Association, 1961.
Lua MLA (8ú heag.)Erickson, E. Walfred. College and University Library Surveys, 1938-1952. American Library Association, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.