Grey, Z., & Duer, D. (1994). Riders of the purple sage (Authorized ed.). University of Nebraska Press.
Cita Chicago Style (17a ed.)Grey, Zane, y Douglas Duer. Riders of the Purple Sage. Authorized ed. Lincoln: University of Nebraska Press, 1994.
Cita MLA (8a ed.)Grey, Zane, y Douglas Duer. Riders of the Purple Sage. Authorized ed. University of Nebraska Press, 1994.
Precaución: Estas citas no son 100% exactas.