Axelrod, D. I. (1998). The oligocene haynes creek flora of eastern Idaho. University of California Press.
Cita Chicago (17th ed.)Axelrod, Daniel I. The Oligocene Haynes Creek Flora of Eastern Idaho. Berkeley: University of California Press, 1998.
Cita MLA (9th ed.)Axelrod, Daniel I. The Oligocene Haynes Creek Flora of Eastern Idaho. University of California Press, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.