Although when I'm in self-promoting mode [hey, I'm a marketer] I say I have written X number of books, in reality I have written one less than that and contributed to another. Online Marketing is the one to which I have contributed. That contribution consists predominantly of four complete chapters plus another chapter that was broken up in an early draft and the contents used elsewhere in the book.
The lead author - Richard Gay - recruited me back in 2004 [yep, it takes that long for an academic text to get from writing to publication] and whether it was by luck or judgement my view towards an academic text on e-marketing was very similar to Richard's.