http://www.heritage.org/research/reports/2013/09/remaking-the-world-progressivism-and-american-foreign-policy

http://dissidentvoice.org/2013/01/what-is-progressivism/

http://www.heritage.org/research/reports/2014/02/the-birth-of-direct-democracy-what-progressivism-did-to-the-states

http://www.ushistory.org/us/42.asp

http://www.studythepast.com/his164/materials/powerpoints/progressiveera_fall_10.pdf
http://www.iupui.edu/~history/classes/2001/fall/progressiveera.htm
http://www.mrmanos.com/documents/1900-1945ReviewNotes.pdf
http://www.loc.gov/teachers/classroommaterials/presentationsandactivities/presentations/timeline/progress/

http://www.u-s-history.com/pages/h1061.html

http://www.novelguide.com/reportessay/history/american-history/progressivism-and-its-effects

http://chnm.gmu.edu/7tah/units_7tah.php?seventahid=7

https://www.americanprogress.org/issues/progressive-movement/report/2010/04/14/7593/social-movements-and-progressivism/

http://www.shrm.org/legalissues/federalresources/federalstatutesregulationsandguidanc/pages/shermananti-trustactof1890.aspx

http://www.apstudynotes.org/us-history/topics/the-progressive-presidents/

http://www.cliffsnotes.com/more-subjects/history/us-history-ii/the-progressive-era-19001920/progressivism-roosevelt-and-taft