Cita APA (7a ed.)

Grey, Z., & Bell, F. (1993). Riders of the purple sage. Heinemann.

Cita Chicago Style (17a ed.)

Grey, Zane, y Florence Bell. Riders of the Purple Sage. Oxford: Heinemann, 1993.

Cita MLA (8a ed.)

Grey, Zane, y Florence Bell. Riders of the Purple Sage. Heinemann, 1993.