Birkelbach. A Cycle of the West. Bison Books, University of Nebraska Press.
Dyfyniad Arddull ChicagoBirkelbach. A Cycle of the West. Bison Books, University of Nebraska Press.
Dyfyniad MLABirkelbach. A Cycle of the West. Bison Books, University of Nebraska Press.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.