Noel, T. J. (2000). A Pikes Peak partnership: The Penroses and the Tutts (1st pbk. ed.). University Press of Colorado.
Chicago-Zitierstil (17. Ausg.)Noel, Thomas J. A Pikes Peak Partnership: The Penroses and the Tutts. 1st pbk. ed. Boulder: University Press of Colorado, 2000.
MLA-Zitierstil (9. Ausg.)Noel, Thomas J. A Pikes Peak Partnership: The Penroses and the Tutts. 1st pbk. ed. University Press of Colorado, 2000.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.