It depends how old the book is, Nakamura... And you have not mentioned which B737 you are talking about. If it is an old 737-200 with JT8D engines, it has a bucket reverser. If it is a 737-300 or later, it will have CFM-56 with a big fan (and a bypass-ratio of about 5:1), with fan-reversers only, but more modern brakes. This makes for a different ball-game.
But perhaps I should say that, if you are on a limiting and/or contaminated runway, USE EVERYTHING AVAILABLE to stop. In the recent A340-600 runway over-run at Quito, it is said the R/W was so slippery that the anti-skid brakes did not give a good enough deceleration. If they had been able to use reverse, even at idle power, it would have made a big difference. [They could not, because L/G damage fooled the A/C into 'thinking' that it was still airborne.]