APA (7th ed.) Citation

Graphic Maps of Houston, Ltd. (2004). Houston graphic map & downtown Houston. Graphic Maps of Houston.

Chicago Style (17th ed.) Citation

Graphic Maps of Houston, Ltd. Houston Graphic Map & Downtown Houston. Houston, TX: Graphic Maps of Houston, 2004.

MLA (9th ed.) Citation

Graphic Maps of Houston, Ltd. Houston Graphic Map & Downtown Houston. Graphic Maps of Houston, 2004.