APA (7th ed.) Citation

Geological Survey (U.S.), Karl, S. M., & Koch, R. D. (1990). Maps and preliminary interpretation of anomalous rock geochemical data from the Petersburg quadrangle and parts of Port Alexander, Sitka, and Sumdum quadrangles, southeastern Alaska. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), Susan M. Karl, and Richard D. Koch. Maps and Preliminary Interpretation of Anomalous Rock Geochemical Data from the Petersburg Quadrangle and Parts of Port Alexander, Sitka, and Sumdum Quadrangles, Southeastern Alaska. Reston, Va.: The Survey, 1990.

MLA (9th ed.) Citation

Geological Survey (U.S.), et al. Maps and Preliminary Interpretation of Anomalous Rock Geochemical Data from the Petersburg Quadrangle and Parts of Port Alexander, Sitka, and Sumdum Quadrangles, Southeastern Alaska. The Survey, 1990.