Bet You Didn't Know. (2013). The History Channel website. Retrieved 5:37, May 18, 2013, from http://www.history.com/shows/mankind-the-story-of-all-of-us/interactives/bet-you-didnt-know.
Bet You Didn't Know. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/shows/mankind-the-story-of-all-of-us/interactives/bet-you-didnt-know [Accessed 18 May 2013].
“Bet You Didn't Know.” 2013. The History Channel website. May 18 2013, 5:37 http://www.history.com/shows/mankind-the-story-of-all-of-us/interactives/bet-you-didnt-know.
“Bet You Didn't Know,” The History Channel website, 2013, http://www.history.com/shows/mankind-the-story-of-all-of-us/interactives/bet-you-didnt-know [accessed May 18, 2013].
“Bet You Didn't Know,” The History Channel website, http://www.history.com/shows/mankind-the-story-of-all-of-us/interactives/bet-you-didnt-know (accessed May 18, 2013).
Bet You Didn't Know [Internet]. The History Channel website; 2013 [cited 2013 May 18] Available from: http://www.history.com/shows/mankind-the-story-of-all-of-us/interactives/bet-you-didnt-know.
Bet You Didn't Know, http://www.history.com/shows/mankind-the-story-of-all-of-us/interactives/bet-you-didnt-know (last visited May 18, 2013).
Bet You Didn't Know. The History Channel website. 2013. Available at: http://www.history.com/shows/mankind-the-story-of-all-of-us/interactives/bet-you-didnt-know. Accessed May 18, 2013.