Boyd. A Life on the Middle West's Never-Ending Frontier. University of Iowa Press.
Cita Chicago Style (17a ed.)Boyd. A Life on the Middle West's Never-Ending Frontier. University of Iowa Press.
Cita MLA (9a ed.)Boyd. A Life on the Middle West's Never-Ending Frontier. University of Iowa Press.
Precaución: Estas citas no son 100% exactas.