Hola Sergio:
Brother Adam?:
One of the most revereed and best informed beekeeper in the whole world.
Two books worth reading (written by him) are:
   In Search of the best Strains of Bees
   Breeding the Honeybee
 
I am sure that you might be able to obtain any of his books if you contract
IBRA on the net.
Best regards.
Dr. Rodriguez
Virginia Beach, VA