Cita APA (7a ed.)

Kesselman, M., & Watstein, S. B. (1987). The Measurement of Reference and Information Services.

Cita Chicago Style (17a ed.)

Kesselman, Martin, y Sarah Barbara Watstein. The Measurement of Reference and Information Services. 1987.

Cita MLA (9a ed.)

Kesselman, Martin, y Sarah Barbara Watstein. The Measurement of Reference and Information Services. 1987.