APA (7th ed.) Zitazioa

Spence, R. (1989). Clipper programming guide. Microtrend Books.

Chicago Style (17th ed.) Zitazioa

Spence, Rick. Clipper Programming Guide. San Marcos, CA: Microtrend Books, 1989.

MLA (9th ed.) Zitazioa

Spence, Rick. Clipper Programming Guide. Microtrend Books, 1989.

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