Jacobson, R. J. (1993). Coal resources of the Dekoven and Davis Members (Carbondale Formation) in Gallatin and Saline Counties, Southeastern Illinois.
Chicago-Zitierstil (17. Ausg.)Jacobson, Russell J. Coal Resources of the Dekoven and Davis Members (Carbondale Formation) in Gallatin and Saline Counties, Southeastern Illinois. Champaign, Ill, 1993.
MLA-Zitierstil (9. Ausg.)Jacobson, Russell J. Coal Resources of the Dekoven and Davis Members (Carbondale Formation) in Gallatin and Saline Counties, Southeastern Illinois. 1993.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.