Peebles, P. James E.; Jr, Lyman A. Page; Partridge, R. Bruce (March 26, 2009). Finding the Big Bang. Cambridge University Press. pp. 159–160. ISBN978-0-521-51982-3.
"Holmdel Horn Antenna". National Historic Landmark summary listing. National Park Service. June 23, 2008. Archived from the original on February 25, 2009.
"Holmdel Horn Antenna". National Historic Landmark summary listing. National Park Service. June 23, 2008. Archived from the original on February 25, 2009.
"Echo 1, 1A, 2". Mission and Spacecraft Library. NASA. Archived from the original on May 27, 2010. Retrieved February 6, 2010.