Bradford, S. C., Berggren, D., & Du Montelle, P. B. (1987). Characteristics and potential uses of waste from the historic Longwall Coal Mining District in North-Central Illinois. Illinois State Geolog. Survey.
Chicago-Zitierstil (17. Ausg.)Bradford, Susan C., Dwain Berggren, und Paul B. Du Montelle. Characteristics and Potential Uses of Waste from the Historic Longwall Coal Mining District in North-Central Illinois. Champaign, Ill: Illinois State Geolog. Survey, 1987.
MLA-Zitierstil (9. Ausg.)Bradford, Susan C., et al. Characteristics and Potential Uses of Waste from the Historic Longwall Coal Mining District in North-Central Illinois. Illinois State Geolog. Survey, 1987.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.