How can i find a used car book value?

I try to find out my old car value before I'm decide to trade in for the new model.Which book or website is trusted resource for car prices?|||I think you better go check your old car price at http://www.tradeincarquote.com/tradein because they gives you more acculate value than the price from used car book.just my 2cent|||NADA.com thats what all the banks lend off of. This will give you the most accurate price for your car. Other than that dealerships go off of ove which is the prices that cars are bringing at auction and that is the price that they will most likely give for trades.|||kbb.com and nada.com are both really good, but they are just guides. Make sure to be very honest about the condition (kbb has a condition quiz if not sure) and look at trade values. Dealers do not need to give retail for cars.|||You can try Kelly Blue Book. KBB.com or Edmunds.com