APA (7th ed.) Citation

Watstein, S. B., Calarco, P. V., & Ghaphery, J. S. (1999). Digital Library: Keywords. RSR: Reference Services Review, 27(4), 344.

Chicago Style (17th ed.) Citation

Watstein, Sarah B., Pascal V. Calarco, and James S. Ghaphery. "Digital Library: Keywords." RSR: Reference Services Review 27, no. 4 (1999): 344.

MLA (9th ed.) Citation

Watstein, Sarah B., et al. "Digital Library: Keywords." RSR: Reference Services Review, vol. 27, no. 4, 1999, p. 344.