NGC Photo Proof(1994.).„1971-78 Dollar Eisenhower”.CoinSite.ROKO Design Group, Inc.Arhiviranoiz originalana datum 2013-08-30.Pristupljeno 20. srpnja 2009.
A NASA transcript explains that the "a" article was intended, whether or not it was said;Arhivirano 2019-09-03 na Wayback Machine-u the intention was to contrast a man (an individual's action) and mankind (as a species).
„After Splashdown”.Apollo to the Moon.Smithsonian Institution Air and Space Museum.srpanj 1999..Arhiviranoiz originalana datum 2004-02-24.Pristupljeno 2015-04-28.
A NASA transcript explains that the "a" article was intended, whether or not it was said;Arhivirano 2019-09-03 na Wayback Machine-u the intention was to contrast a man (an individual's action) and mankind (as a species).
„After Splashdown”.Apollo to the Moon.Smithsonian Institution Air and Space Museum.srpanj 1999..Arhiviranoiz originalana datum 2004-02-24.Pristupljeno 2015-04-28.
NGC Photo Proof(1994.).„1971-78 Dollar Eisenhower”.CoinSite.ROKO Design Group, Inc.Arhiviranoiz originalana datum 2013-08-30.Pristupljeno 20. srpnja 2009.