APA (7th ed.) Citation

Baltimore County Public Library & Childers, T. (1967). Book catalog and card catalog: A cost and service study. The Library.

Chicago Style (17th ed.) Citation

Baltimore County Public Library and Thomas Childers. Book Catalog and Card Catalog: A Cost and Service Study. Towson, Md.: The Library, 1967.

MLA (8th ed.) Citation

Baltimore County Public Library and Thomas Childers. Book Catalog and Card Catalog: A Cost and Service Study. The Library, 1967.