APA (7th ed.) Citation

Downs, R. B., & Downs, E. C. (1973). British Library Resources; A Bibliographical Guide.

Chicago Style (17th ed.) Citation

Downs, Robert B., and Elizabeth C. Downs. British Library Resources; A Bibliographical Guide. 1973.

MLA (9th ed.) Citation

Downs, Robert B., and Elizabeth C. Downs. British Library Resources; A Bibliographical Guide. 1973.

Warning: These citations may not always be 100% accurate.