American Library Association. Statistics Coordinating Project. (1966). Library statistics: A handbook of concepts, definitions, and terminology. American Library Association.
Cita Chicago (17th ed.)American Library Association. Statistics Coordinating Project. Library Statistics: A Handbook of Concepts, Definitions, and Terminology. Chicago: American Library Association, 1966.
Cita MLA (9th ed.)American Library Association. Statistics Coordinating Project. Library Statistics: A Handbook of Concepts, Definitions, and Terminology. American Library Association, 1966.
Atenció: Aquestes cites poden no estar 100% correctes.