APA (7th ed.) Citation

Osborn, A. D. (1968). A Dual System for Indexing Library and Information Literature.

Chicago Style (17th ed.) Citation

Osborn, Andrew D. A Dual System for Indexing Library and Information Literature. 1968.

MLA (9th ed.) Citation

Osborn, Andrew D. A Dual System for Indexing Library and Information Literature. 1968.

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