APA (7th ed.) Citation

Hays, S. P. (1959). Conservation and the gospel of efficiency: The progressive conservation movement, 1890-1920. Harvard University Press.

Chicago Style (17th ed.) Citation

Hays, Samuel P. Conservation and the Gospel of Efficiency: The Progressive Conservation Movement, 1890-1920. Cambridge, Mass: Harvard University Press, 1959.

MLA (9th ed.) Citation

Hays, Samuel P. Conservation and the Gospel of Efficiency: The Progressive Conservation Movement, 1890-1920. Harvard University Press, 1959.