We have got a collection of not one but two videos elaborating on the evolution of the 911 and the 911 turbo, which are one of the best sports cars ever made.
While both of the videos are nowhere near as informative as wikipedia (which is the best source according to me), they do give some little information that they can to explain the awesome 911. Enjoy the videos!
The second video is from the Meet the ancestors series by AutocarUK. Here it is
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Source : Germancarblog for the first video; Second one courtesy AutocarUK