Kaplan, L. (1952). The growth of reference service in the United States from 1876 to 1893. Publications Committee, Association of College and Reference Libraries.
Lua i Stíl Chicago (17ú heag.)Kaplan, Louis. The Growth of Reference Service in the United States from 1876 to 1893. [Chicago]: Publications Committee, Association of College and Reference Libraries, 1952.
Lua MLA (8ú heag.)Kaplan, Louis. The Growth of Reference Service in the United States from 1876 to 1893. Publications Committee, Association of College and Reference Libraries, 1952.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.