APA (7th ed.) Citation

Keller, W. K. (1978). Youth services information system: YSIS.

Chicago Style (17th ed.) Citation

Keller, William K. Youth Services Information System: YSIS. Arlington, 1978.

MLA (8th ed.) Citation

Keller, William K. Youth Services Information System: YSIS. 1978.

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