John Quincy Adams (1821). “An Address, Delivered at the Request of the Committee of Arrangements for Celebrating the Anniversary of Independence: At the City of Washington on the Fourth of July 1821, Upon the Occasion of Reading the Declaration of Independence. ...”, p.31
"Bridges Not Barriers: Securing Futures and Improving Lives Through Expanded Foreign Aid" by Thomas H. Kean and Ray Chambers, www.huffingtonpost.com. September 20, 2012.
United States. President (1981-1989 : Reagan), United States. President (1981-1989 : Reagan)., Ronald Reagan, United States. Office of the Federal Register (1982). “Ronald Reagan”