Cita APA (7a ed.)

Spence, R. (1991). Clipper programming guide (2nd ed.). Microtrend Books.

Cita Chicago Style (17a ed.)

Spence, Rick. Clipper Programming Guide. 2nd ed. San Marcos, CA: Microtrend Books, 1991.

Cita MLA (9a ed.)

Spence, Rick. Clipper Programming Guide. 2nd ed. Microtrend Books, 1991.