Cita APA (7th ed.)

AARON, B., & AARON, A. (1991). Upgrading PCS made easy. Osborne McGraw-Hill.

Cita Chicago (17th ed.)

AARON, Bud, i Alex AARON. Upgrading PCS Made Easy. Berkeley: Osborne McGraw-Hill, 1991.

Cita MLA (9th ed.)

AARON, Bud, i Alex AARON. Upgrading PCS Made Easy. Osborne McGraw-Hill, 1991.