1940's
- "History of the Atomic Bomb & The Manhattan Project." About.com Inventors. 20 May 2013 <http://inventors.about.com/od/astartinventions/a/atomic_bomb.htm>.
- "The Jitterbug Dance Craze of the 1940′s." Mortal Journey. 21 May 2013 <http://www.mortaljourney.com/2011/01/1940-trends/jitterbug-dance>.
- WW2 Quotes." WW2 Quotes. 21 May 2013 <http://www.secondworldwarhistory.com/ww2-quotes.asp>.
- "Attack At Pearl Harbor, 1941 - The Japanese View." Attack At Pearl Harbor, 1941 - The Japanese View. 21 May 2013 <http://www.eyewitnesstohistory.com/pearl2.htm>.
1950's
- "Rosa Parks Refuses to Give Up Her Bus Seat." About.com 20th Century History. 20 May 2013 <http://history1900s.about.com/od/1950s/qt/RosaParks.htm>.
- "Montgomery Bus Boycott." History.com. A&E Television Networks. 20 May 2013 <http://www.history.com/topics/montgomery-bus-boycott>.
- "Korean War." History.com. A&E Television Networks. 20 May 2013 <http://www.history.com/topics/korean-war>
- Infoplease. Infoplease. 20 May 2013 <http://www.infoplease.com/encyclopedia/history/korean-war.html>.
- "The Korean War Quotes." Shmoop. 20 May 2013 <http://www.shmoop.com/korean-war/quotes.html>.
- "Horrifying 1950's Ads." Funny or Die. 20 May 2013 <http://www.funnyordie.com/slideshows/2a52743135/horrifying-1950-s-ads>.
1980's
- "Giorgio Armani Quotes & Sayings." Search Quotes. 20 May 2013 <http://www.searchquotes.com/quotation/The_difference_between_style_and_fashion_is_quality./31524/>.
- "1980s in fashion." Wikipedia. 18 May 2013. Wikimedia Foundation. 20 May 2013 <http://en.wikipedia.org/wiki/1980s_in_fashion>.
- "What Did Men Wear in the 80s?" LoveToKnow. 20 May 2013 <http://mens-fashion.lovetoknow.com/What_Did_Men_Wear_in_the_80s>.
- "The 1980s." History.com. A&E Television Networks. 20 May 2013 <http://www.history.com/topics/1980s>.
1990's
- "1990s Technology Timeline: Massive Growth During the Decade of the 90s." Bright Hub. 20 May 2013 <http://www.brighthub.com/education/homework-tips/articles/123405.aspx>.
- "Internet." Wikipedia. 19 May 2013. Wikimedia Foundation. 20 May 2013 <http://en.wikipedia.org/wiki/Internet>.
- "American Cultural History." - Decade 1991-1999. 20 May 2013 <http://kclibrary.lonestar.edu/decade90.html>
- YouTube. YouTube. 27 Oct. 2010. YouTube. 20 May 2013 <http://www.youtube.com/watch?v=sHbo6zjTW6s>..
- "B-Movies Extended: The 10 Funniest Comedies of the 1990s." CraveOnline. 20 May 2013 <http://www.craveonline.com/film/articles/491397-b-movies-extended-the-10-funniest-comedies-of-the-1990s>.
2000's
- "The 2000-2009 Decade." Timetoast. 20 May 2013 <http://www.timetoast.com/timelines/50826>.
- "The Y2k scare." The Y2k scare. 20 May 2013 <http://www.quetek.com/dictionary/y2k-scare.html>.
- 31, December. "The 2000s sports hall of fame and shame." Los Angeles Times. 31 Dec. 2009. Los Angeles Times. 20 May 2013 <http://articles.latimes.com/2009/dec/31/sports/la-sp-fame-shame31-2009dec31>.