APA (7th ed.) Citation

Scott, G. R. (1999). Historic trail map of the Denver 1⁰ x 2⁰ quadrangle, central Colorado. The Survey.

Chicago Style (17th ed.) Citation

Scott, Glenn R. Historic Trail Map of the Denver 1⁰ X 2⁰ Quadrangle, Central Colorado. [Reston, Va.]: The Survey, 1999.

MLA (9th ed.) Citation

Scott, Glenn R. Historic Trail Map of the Denver 1⁰ X 2⁰ Quadrangle, Central Colorado. The Survey, 1999.