Please suggest a book including cross section

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I am reading some material on laser physics and quantum physics, there involes something called absorption cross section, collision cross section, differential cross section and so on quite often. I try to google the definition online but many website or book just give the formula instead of explaining how it come from and how it works. Anyone recommend a book for me?
 
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Do you know the cross section definition given in Classical Mechanics? Any book contains it.
 

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