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I liked the mentioned article by Massey very much too, but I guess the best descriptions are still Deligne's SGA 7,part II, chapters 13, 14, where he even draws some figures. I found Wall: "Periods of Integrals and Topology of Algebraic Varieties", Griffiths "summary" and his "Periods III" very helpfull, parts of this motivic book too. Related to the theme is the local monodromy theorem, about that, monodromy-weight conjecture etc., I found Illusie's article in Asterisque 223 very good.