APA (7th ed.) Citation

Parker, S., & Essary, K. (1975). A Manual SDI System for Academic Libraries.

Chicago Style (17th ed.) Citation

Parker, Steve, and Kathy Essary. A Manual SDI System for Academic Libraries. 1975.

MLA (9th ed.) Citation

Parker, Steve, and Kathy Essary. A Manual SDI System for Academic Libraries. 1975.

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