APA aipamena

Hays, S. (1972). #aConservation and the gospel of efficiency: The progressive conservation movement, 1890-1920. Atheneum.

Chicago Style aipamena

Hays, Samuel. #aConservation and the Gospel of Efficiency: The Progressive Conservation Movement, 1890-1920. New York: Atheneum, 1972.

MLA aipamena

Hays, Samuel. #aConservation and the Gospel of Efficiency: The Progressive Conservation Movement, 1890-1920. Atheneum, 1972.