Cita APA (7a ed.)

Feldmeier, D. C., & Karn, P. R. UNIX password security: Ten years later.

Cita Chicago Style (17a ed.)

Feldmeier, David C., y Philip R. Karn. UNIX Password Security: Ten Years Later.

Cita MLA (9a ed.)

Feldmeier, David C., y Philip R. Karn. UNIX Password Security: Ten Years Later.