APA (7th ed.) Zitazioa

Maps.com (Firm) & ebrary, Inc. (2001). Houston area. Maps.com.

Chicago Style (17th ed.) Zitazioa

Maps.com (Firm) eta Inc ebrary. Houston Area. [S.l.]: Maps.com, 2001.

MLA (9th ed.) Zitazioa

Maps.com (Firm) eta Inc ebrary. Houston Area. Maps.com, 2001.