Bureau of the Census 1975,第888頁. Bureau of the Census. International Transactions and Foreign Commerce(PDF). Historical Statistics of the United States from Colonial Times to 1970, Part 2 (PDF)使用|format=需要含有|url= (帮助) Bicentennial. Washington, D. C.: U. S. Department of Commerce. 1975: 888 [2020-11-15]. (原始内容存档(PDF)于2017-12-25).
Bryant-Jones 1941,第148頁. Bryant-Jones, Mildred. The political program of Thaddeus Stevens, 1865. Phylon (Atlanta: Clark Atlanta University). 1941, 2 (2, 2nd Qtr. 1941): 147–154. JSTOR 271784. doi:10.2307/271784.
Bryant-Jones 1941,第148–149頁. Bryant-Jones, Mildred. The political program of Thaddeus Stevens, 1865. Phylon (Atlanta: Clark Atlanta University). 1941, 2 (2, 2nd Qtr. 1941): 147–154. JSTOR 271784. doi:10.2307/271784.
Scovel 1898,第550頁. Scovel, James M. Thaddeus Stevens. Lippincott's Monthly Magazine, A Popular Journal of General Literature (Philadelphia: J.B. Lippincott Company). 1898: 550 [2020-11-15]. (原始内容存档于2020-12-20).
Bryant-Jones 1941,第148頁. Bryant-Jones, Mildred. The political program of Thaddeus Stevens, 1865. Phylon (Atlanta: Clark Atlanta University). 1941, 2 (2, 2nd Qtr. 1941): 147–154. JSTOR 271784. doi:10.2307/271784.
Bryant-Jones 1941,第148–149頁. Bryant-Jones, Mildred. The political program of Thaddeus Stevens, 1865. Phylon (Atlanta: Clark Atlanta University). 1941, 2 (2, 2nd Qtr. 1941): 147–154. JSTOR 271784. doi:10.2307/271784.
Andreasen 2000,第78頁. Andreasen, Bryon C. Thaddeus Stevens: Nineteenth-Century Egalitarian by Hans L. Trefousse: Review. Journal of the Abraham Lincoln Association (Champaign, IL: University of Illinois Press). Summer 2000, 21 (2): 75–81. JSTOR 20149003.
Andreasen 2000,第76–77頁. Andreasen, Bryon C. Thaddeus Stevens: Nineteenth-Century Egalitarian by Hans L. Trefousse: Review. Journal of the Abraham Lincoln Association (Champaign, IL: University of Illinois Press). Summer 2000, 21 (2): 75–81. JSTOR 20149003.
Andreasen 2000,第79頁. Andreasen, Bryon C. Thaddeus Stevens: Nineteenth-Century Egalitarian by Hans L. Trefousse: Review. Journal of the Abraham Lincoln Association (Champaign, IL: University of Illinois Press). Summer 2000, 21 (2): 75–81. JSTOR 20149003.
Andreasen 2000,第79–80頁. Andreasen, Bryon C. Thaddeus Stevens: Nineteenth-Century Egalitarian by Hans L. Trefousse: Review. Journal of the Abraham Lincoln Association (Champaign, IL: University of Illinois Press). Summer 2000, 21 (2): 75–81. JSTOR 20149003.
Andreasen 2000,第75頁. Andreasen, Bryon C. Thaddeus Stevens: Nineteenth-Century Egalitarian by Hans L. Trefousse: Review. Journal of the Abraham Lincoln Association (Champaign, IL: University of Illinois Press). Summer 2000, 21 (2): 75–81. JSTOR 20149003.
Andreasen 2000,第80頁. Andreasen, Bryon C. Thaddeus Stevens: Nineteenth-Century Egalitarian by Hans L. Trefousse: Review. Journal of the Abraham Lincoln Association (Champaign, IL: University of Illinois Press). Summer 2000, 21 (2): 75–81. JSTOR 20149003.
Andreasen 2000,第77頁. Andreasen, Bryon C. Thaddeus Stevens: Nineteenth-Century Egalitarian by Hans L. Trefousse: Review. Journal of the Abraham Lincoln Association (Champaign, IL: University of Illinois Press). Summer 2000, 21 (2): 75–81. JSTOR 20149003.
Tarbell 1912,第96–97頁. Tarbell, Ida M. The Tariff in Our Times. The Economic Journal (New York: Macmillan). 1912-03-01, 22 (85): 96–97 [2020-11-15]. (原始内容存档于2020-12-20).
Scovel 1898,第550頁. Scovel, James M. Thaddeus Stevens. Lippincott's Monthly Magazine, A Popular Journal of General Literature (Philadelphia: J.B. Lippincott Company). 1898: 550 [2020-11-15]. (原始内容存档于2020-12-20).
Bureau of the Census 1975,第888頁. Bureau of the Census. International Transactions and Foreign Commerce(PDF). Historical Statistics of the United States from Colonial Times to 1970, Part 2 (PDF)使用|format=需要含有|url= (帮助) Bicentennial. Washington, D. C.: U. S. Department of Commerce. 1975: 888 [2020-11-15]. (原始内容存档(PDF)于2017-12-25).
Tarbell 1912,第96–97頁. Tarbell, Ida M. The Tariff in Our Times. The Economic Journal (New York: Macmillan). 1912-03-01, 22 (85): 96–97 [2020-11-15]. (原始内容存档于2020-12-20).