APA (7th ed.) Citation

Siever, R. (1957). Variation in coal reflectance. Illinois State Geological Survey.

Chicago Style (17th ed.) Citation

Siever, Raymond. Variation in Coal Reflectance. Urbana, Ill: Illinois State Geological Survey, 1957.

MLA (9th ed.) Citation

Siever, Raymond. Variation in Coal Reflectance. Illinois State Geological Survey, 1957.

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