Maps.com (Firm) & ebrary, Inc. (2001). Houston area. Maps.com.
Chicago-čujuhus (17. p.)Maps.com (Firm) juo Inc ebrary. Houston Area. [S.l.]: Maps.com, 2001.
MLA-čujuhus (9. p.)Maps.com (Firm) juo Inc ebrary. Houston Area. Maps.com, 2001.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.