APA

(2007). Digital mapping techniques '06--workshop proceedings, June11--14, 2006 Columbus, Ohio. Washington, D.C: U.S. Dept. of the Interior, U.S. Geological Survey.

Chicago

2007. Digital mapping techniques '06--workshop proceedings, June11--14, 2006 Columbus, Ohio. Washington, D.C: U.S. Dept. of the Interior, U.S. Geological Survey.

Harvard

(2007). Digital mapping techniques '06--workshop proceedings, June11--14, 2006 Columbus, Ohio. Washington, D.C: U.S. Dept. of the Interior, U.S. Geological Survey.

MLA

Digital mapping techniques '06--workshop proceedings, June11--14, 2006 Columbus, Ohio. Washington, D.C: U.S. Dept. of the Interior, U.S. Geological Survey. 2007.