Fieldstadt, Elisha (April 22, 2021). "Presidents ranked from worst to best". CBS News (in அமெரிக்க ஆங்கிலம்). Archived from the original on February 3, 2021. பார்க்கப்பட்ட நாள் October 24, 2021.
"John Coolidge, Guardian of President's Legacy. Dies at 93". The New York Times (in அமெரிக்க ஆங்கிலம்). June 4, 2000. பார்க்கப்பட்ட நாள் May 11, 2019. [He] had originally been John Calvin Coolidge, but dropped his first name to avoid confusion and later legally changed it.
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Fieldstadt, Elisha (April 22, 2021). "Presidents ranked from worst to best". CBS News (in அமெரிக்க ஆங்கிலம்). Archived from the original on February 3, 2021. பார்க்கப்பட்ட நாள் October 24, 2021.