Cita APA

Hays, S. P. 1. (1959). Conservation and the Gospel of efficiency: The progressive conservation movement, 1890-1920. Pittsburgh: University of Pittsburg Press.

Citación estilo Chicago

Hays, Samuel Pfrimmer 1921-2017. Conservation and the Gospel of Efficiency: The Progressive Conservation Movement, 1890-1920. Pittsburgh: University of Pittsburg Press, 1959.

Cita MLA

Hays, Samuel Pfrimmer 1921-2017. Conservation and the Gospel of Efficiency: The Progressive Conservation Movement, 1890-1920. Pittsburgh: University of Pittsburg Press, 1959.