APA
ed. Stephen C. Guptill, . (1990). An Enchanced Digital Line Graph Design. Denver: U.S. Geological Survey.
Chicago
ed. Stephen C. Guptill, . 1990. An Enchanced Digital Line Graph Design. Denver: U.S. Geological Survey.
Harvard
ed. Stephen C. Guptill, . (1990). An Enchanced Digital Line Graph Design. Denver: U.S. Geological Survey.
MLA
ed. Stephen C. Guptill, . An Enchanced Digital Line Graph Design. Denver: U.S. Geological Survey. 1990.
