Cita APA (7th ed.)

Richards, J. F. (2003). The unending frontier: An environmental history of the early modern world by. University of California Press.

Cita Chicago (17th ed.)

Richards, John F. The Unending Frontier: An Environmental History of the Early Modern World by. Berkeley: University of California Press, 2003.

Cita MLA (9th ed.)

Richards, John F. The Unending Frontier: An Environmental History of the Early Modern World by. University of California Press, 2003.