Smith, T. G. (2006). Green republican: John Saylor and the preservation of America's wilderness. University of Pittsburgh Press.
Dyfyniad Arddull ChicagoSmith, Thomas G. Green Republican: John Saylor and the Preservation of America's Wilderness. Pittsburgh, Pennsylvania: University of Pittsburgh Press, 2006.
Dyfyniad MLASmith, Thomas G. Green Republican: John Saylor and the Preservation of America's Wilderness. University of Pittsburgh Press, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.