Poker math book for a tournament player?

Hey guys, any recommendations for a book on poker math? My level of math is ok, not A level or degree or anything, but I got a decent grade at gcse level (B). Basically what i'm looking for is a well written book without any complex algebra or anything silly in it. I play sng's & tournaments if this helps? Found a book called: Tournament Killer Poker by the Numbers by Tony Guerrera, but not sure whether it's any good or not? Any help would be much appreciated,

Cheers

Harrington on Holdem has some really good math stuff in it

A mindset of poker, shows some formulas and not need to be a mathematician to know not only experienced if add and multiply and divide ... since it is basically what is done when making a desicion ... luck.

"The bankroll" By Litvak and Marcelo "doc" Tow. This book help to build your bankroll and help me with poker math.