APA Citation

López, I., & Hansen, V. (2008). Geologic map of the Helen Planitia quadrangle (V-52), Venus by Ivan López and Vicki Hansen ; prepared for the National Aeronautics and Space Administration: By Ivan López and Vicki Hansen ; prepared for the National Aeronautics and Space Administration. [Reston, Va.?]: U.S. Dept, of the Interior, U.S. Geological Survey.

Chicago Style Citation

López, Ivan., and Vicki Hansen. Geologic Map of the Helen Planitia Quadrangle (V-52), Venus By Ivan López and Vicki Hansen ; Prepared for the National Aeronautics and Space Administration: By Ivan López and Vicki Hansen ; Prepared for the National Aeronautics and Space Administration. [Reston, Va.?]: U.S. Dept, of the Interior, U.S. Geological Survey, 2008.

MLA Citation

López, Ivan., and Vicki Hansen. Geologic Map of the Helen Planitia Quadrangle (V-52), Venus By Ivan López and Vicki Hansen ; Prepared for the National Aeronautics and Space Administration: By Ivan López and Vicki Hansen ; Prepared for the National Aeronautics and Space Administration. [Reston, Va.?]: U.S. Dept, of the Interior, U.S. Geological Survey, 2008.

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