^Swenson، Loyd S. Jr.؛ Grimwood، James M.؛ Alexander، Charles C. (1989). "This New Ocean: A History of Project Mercury, Chap. 10: 'Ham Paves the Way'". Footnote 37. ناسا (National Aeronautics and Space Administration). مؤرشف من الأصل في 2019-07-14. اطلع عليه بتاريخ 2015-06-22. In reporting the Freedom 7 flight, the press attributed the term to Astronaut Shepard, . A replay of the flight voice communications tape disclosed that Shepard himself did not use the term. . It was Col. John A. "Shorty" Powers . Tecwyn Roberts of STG and Capt. Henry E. Clements of the Air Force had used "A.OK" frequently in reports written more than four months before the Shepard flight. . Be that as it may, Powers, "the voice of Mercury Control," by his public use of "A.OK," made those three letters a universal symbol meaning "in perfect working order."
^"Shorty Powers Preaches Peace". The Toledo Blade. ج. Vol. 135. 12 مايو 1970. ص. 52. مؤرشف من الأصل في 2016-05-19. اطلع عليه بتاريخ 2015-06-28. {{استشهاد بخبر}}: |المجلد= يحوي نصًّا زائدًا (مساعدة) والوسيط غير المعروف |بواسطة= تم تجاهله يقترح استخدام |via= (مساعدة)
