APA-Zitierstil (7. Ausg.)
Hays, S. P. (1999). Conservation and the gospel of efficiency: The progressive conservation movement, 1890-1920. University of Pittsburgh Press.
Chicago-Zitierstil (17. Ausg.)
Hays, Samuel P. Conservation and the Gospel of Efficiency: The Progressive Conservation Movement, 1890-1920. Pittsburgh, Pennsylvania: University of Pittsburgh Press, 1999.
MLA-Zitierstil (9. Ausg.)
Hays, Samuel P. Conservation and the Gospel of Efficiency: The Progressive Conservation Movement, 1890-1920. University of Pittsburgh Press, 1999.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.