APA (7th ed.) Zitazioa

(1994). Understanding the market for geographic information: A market segmentation and characteristics analysis / by William S. Piper and Mark W. Mick.

Chicago Style (17th ed.) Zitazioa

Understanding the Market for Geographic Information: A Market Segmentation and Characteristics Analysis / by William S. Piper and Mark W. Mick. 1994.

MLA (9th ed.) Zitazioa

Understanding the Market for Geographic Information: A Market Segmentation and Characteristics Analysis / by William S. Piper and Mark W. Mick. 1994.