Call of Duty (video game) - Wikipedia

Call of Duty (series), Call of Duty Wiki

Call of Duty: Ghosts, Call of Duty Wiki

Call of War Wiki

Call of Duty (series), Call of Duty Wiki

The Highest-Selling Call Of Duty Games, Ranked (& How Much They Sold)

19 Oldest Call of Duty Games

Call of Duty: Finest Hour, Call of Duty Wiki

Call of Duty Online, Call of Duty Wiki

Call of Duty (series), Call of Duty Wiki

Call of Duty (series), Call of Duty Wiki

What is the Call of Duty game based on? - Quora

Video game review: A conservative, space-heavy sequel to 'Call of Duty

Call of Duty 3 - Wikipedia

Call of Duty: Modern Warfare 2 - Wikipedia