Roberts, L. N. (1991). Coal resources of the Fruitland Formation in Part of the Ute Mountain Ute Indian Reservation, San Juan County, New Mexico. US Gov. Print. Off.
Chicago-Zitierstil (17. Ausg.)Roberts, Laura N. Coal Resources of the Fruitland Formation in Part of the Ute Mountain Ute Indian Reservation, San Juan County, New Mexico. Washington: US Gov. Print. Off, 1991.
MLA-Zitierstil (9. Ausg.)Roberts, Laura N. Coal Resources of the Fruitland Formation in Part of the Ute Mountain Ute Indian Reservation, San Juan County, New Mexico. US Gov. Print. Off, 1991.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.