Simpson, I. S. (1988). Basic statistics for librarians (3rd ed.). Library Association.
Lua i Stíl Chicago (17ú heag.)Simpson, Ian S. Basic Statistics for Librarians. 3rd ed. London: Library Association, 1988.
Lua MLA (9ú heag.)Simpson, Ian S. Basic Statistics for Librarians. 3rd ed. Library Association, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.