Always some garbage (or recycle bumff) out there.

A good book:
Laurence Bergreen, 2011, Columbus. The Four Voyages. Includes much biographical detail. A good sailor (hardly lost a man) but not too good at getting along with the powers that be.

And in his own words:
Robbins, F. E., (translation), Colombo, Cristoforo, Epistola de insulis nuper inventis, plus letter of 1493.