Washington Monument

1. Harvey, Frederock L. (1903): History of the Washington National Monument Society. United States Government Printing Office, Washington (USA).
2. Hansen, Brett (2008): Orchestrating the Obelisk: The Washington Monument. In: Civil Engineering Magazine, v. 78, n. 7 (Juli 2008), S. 38-41.

   https://doi.org/10.1061/ciegag.0000812

3. Tamaro, Mark J. / O'Connor, John G. (1999): Scaling the Monument. In: Civil Engineering Magazine, v. 69, n. 4 (April 1999).
4. Dupré, Judith (1996): Skyscrapers. Black Dog & Loventhal, New York (USA), S. 12-13.
5. Dupré, Judith / Smith, Adrian (2008): Skyscrapers. A History of the World's Most Extraordinary Buildings. 2. Ausgabe, Black Dog & Leventhal Publishers, Inc., New York (USA), ISBN 978-1-57912-787-9, S. 14-15.