APA (7th ed.) Citation

MacGinnis, L. D., & Heigold, P. C. (1961). Regional maps of vertical magnetic intensity in Illinois. Illinois State Geological Survey.

Chicago Style (17th ed.) Citation

MacGinnis, Lyle D., and Paul C. Heigold. Regional Maps of Vertical Magnetic Intensity in Illinois. Urbana, Ill: Illinois State Geological Survey, 1961.

MLA (9th ed.) Citation

MacGinnis, Lyle D., and Paul C. Heigold. Regional Maps of Vertical Magnetic Intensity in Illinois. Illinois State Geological Survey, 1961.

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