Digital raster graphics
MLA
Digital Raster Graphics. [Rolla, MO?]: U.S. Dept. of the Interior, U.S. Geological Survey, 1999
APA, 7th edition
(1999). Digital raster graphics. [Rolla, MO?]: U.S. Dept. of the Interior, U.S. Geological Survey
Chicago, 17th edition
Digital raster graphics. [Rolla, MO?]: U.S. Dept. of the Interior, U.S. Geological Survey, 1999