How I Met Your Mother Mystery vs. History (TV Episode 2011) - IMDb

How I Met Your Mother Landmarks (TV Episode 2011) - Trivia - IMDb

How I Met Your Mother The Naked Truth (TV Episode 2011) - IMDb

Mystery vs History – Season 7 Episode 6, The How I Met Your Mother site

How I Met Your Mother Tick Tick Tick (TV Episode 2011) - IMDb

How I Met Your Mother The Naked Truth (TV Episode 2011) - IMDb

List of How I Met Your Mother episodes - Wikipedia

How I Met Your Mother (TV Series 2005–2014) - Episode list - IMDb

How I Met Your Mother (TV Series 2005–2014) - Series Cast & Crew - IMDb

How I Met Your Mother Mystery vs. History (TV Episode 2011) - IMDb

How I Met Your Mother (TV Series 2005–2014) - IMDb