Cita APA (7a ed.)

Gralla, P. (1992). Pc computing guide to shareware. Ziff-Davis Press.

Cita Chicago Style (17a ed.)

Gralla, Preston. Pc Computing Guide to Shareware. California: Ziff-Davis Press, 1992.

Cita MLA (9a ed.)

Gralla, Preston. Pc Computing Guide to Shareware. Ziff-Davis Press, 1992.