APA (7th ed.) Citation

Powers, A. C., Shedd, J., & Hill, C. (2011). The Role of Virtual Reference in Library Web Site Design: A Qualitative Source for Usage Data.

Chicago Style (17th ed.) Citation

Powers, Amanda Clay, Julie Shedd, and Clay Hill. The Role of Virtual Reference in Library Web Site Design: A Qualitative Source for Usage Data. 2011.

MLA (9th ed.) Citation

Powers, Amanda Clay, et al. The Role of Virtual Reference in Library Web Site Design: A Qualitative Source for Usage Data. 2011.