NGC Photo Proof (1994.). „1971-78 Dollar Eisenhower”. CoinSite. ROKO Design Group, Inc. Arhivirano iz originala na datum 2013-08-30. Pristupljeno 20. srpnja 2009.
A NASA transcript explains that the "a" article was intended, whether or not it was said;[1]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.. Arhivirano iz originala na datum 2004-02-24. Pristupljeno 2015-04-28.
A NASA transcript explains that the "a" article was intended, whether or not it was said;[1]Arhivirano 2019-09-03 na Wayback Machine-u the intention was to contrast a man (an individual's action) and mankind (as a species).
NASA. „Apollo Tables”. Arhivirano iz originala na datum 2006-10-01. Pristupljeno 23. rujna 2006.
„After Splashdown”. Apollo to the Moon. Smithsonian Institution Air and Space Museum. srpanj 1999.. Arhivirano iz originala na datum 2004-02-24. Pristupljeno 2015-04-28.
NGC Photo Proof (1994.). „1971-78 Dollar Eisenhower”. CoinSite. ROKO Design Group, Inc. Arhivirano iz originala na datum 2013-08-30. Pristupljeno 20. srpnja 2009.