APA (7th ed.) Citation

(1999). Principal rivers, roads, and canals, 1840. Maps.com.

Chicago Style (17th ed.) Citation

Principal Rivers, Roads, and Canals, 1840. [S.l.]: Maps.com, 1999.

MLA (9th ed.) Citation

Principal Rivers, Roads, and Canals, 1840. Maps.com, 1999.

Warning: These citations may not always be 100% accurate.