This primary source comes from the Collection RN-WHPO: White House Photo Office Collection (Nixon Administration).
Full Citation: WHPO-6069-08A; President Richard Nixon and Pat Nixon with World Heavyweight Boxing Champion Joe Frazier and Family; 4/19/1971; Nixon White House Photographs, 1/20/1969 - 8/9/1974; Collection RN-WHPO: White House Photo Office Collection (Nixon Administration); Richard Nixon Library, Yorba Linda, CA. [Online Version, https://docsteach.org/documents/document/richard-and-pat-nixon-with-joe-frazier-family, April 26, 2024]