«Presidents ranked from worst to best». www.cbsnews.com(engelsk). Besøkt 20. januar 2021. «How will history judge President Donald Trump? One day, we'll have an answer, thanks to C-SPAN's Presidential Historians Survey. The 2017 version, which polled 91 historians, saw several presidents rise and fall in the rankings. Historians evaluated them based on 10 qualities of presidential leadership, including economic management, international relations, crisis leadership, public persuasion skills and whether they pursued equal justice for all. And of course, President Barack Obama was added to the lineup for the first time this year. Which are ranked as the best presidents?»
Nussbaum, Matthew (19. februar 2018). «Trump comes in last in expert presidential rankings survey». POLITICO(engelsk). Besøkt 20. januar 2021. «That was the finding of the 2018 Presidents & Executive Politics Presidential Greatness Survey, released Monday by professors Brandon Rottinghaus of the University of Houston and Justin S. Vaughn of Boise State University. The survey results, ranking American presidents from best to worst, were based on responses from 170 current and recent members of the Presidents and Executive Politics section of the American Political Science Association.»
