recommended sales/marketing books?

thanks guys - i just have to find some serious time. i don't know how others do it! managed to wrangle junior a friend so i am freed up while they destruct my bedroom ... but only so i can paint the bathroom ceiling, so the shower screen can go in next week!

then i've go to organise laundry linen cupboards, paint the exterior rear of the house, two more rooms (spare and living), paint the exterior windows and chimney stack ... hmmm, then i might be done-ish.

hoping this year goes slower than last so i can fit everything in!