APA (7th ed.) Citation

Tenopir, C., & Ennis, L. (2002). A Decade of Digital Reference, 1991-2001.

Chicago Style (17th ed.) Citation

Tenopir, Carol, and Lisa Ennis. A Decade of Digital Reference, 1991-2001. 2002.

MLA (9th ed.) Citation

Tenopir, Carol, and Lisa Ennis. A Decade of Digital Reference, 1991-2001. 2002.

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