I have (and have read) the Cisco "Fundamentals" book, but I prefer the Planet9 "CWNA"(Certified Wireless Network Admin) book published through Osborne.
IMO, the concepts are explained better, the diagrams are better, and overall, the book addresses the topic from a more practical point-of-view.
For the tests I took, there was more appropriate information in the CWNA book than there was in the Fundamentals book.
ps: If you're going to sell wireless, under no circumstances should you sell a system without also selling (or performing) a site survey. If the customer won't pay for a site survey, either rebate the cost back once the system is sold or walk away.
The grief and expense of correcting a system installed blindly is easily more than the margin you get from the sale. I think you'll find that the customer satisfaction post-sale will also be much higher.
Since I cannot find the book u recommend, I would like to ask you if you can give me some tips for the wireless sales exam. Is it diffcult? I have passed the CSE very easily and although I have recently graduated from uni, I know lots of thing about WLAN.
Any tips for the exam? For instance questions about WLAN Return on Investment, WLAN in the financial sector...Is the exam very difficult? How many questions...I would be happy if you can provide me with additional info on the exam.