Re: a) Overview, the big picture
Beekeepers Handbook for sure if you have the urge to just let em' loose on a book with the thinking they are general public. This is also assuming you are gearing your programme to a certain level of proficiency.
Alternatively, I'd actually recommend ABC & XYZ and teach from select sections. That way the protege bee whisperers could have additional references at their learning level should they already have found BeeSource. Most beekeeping classes are more elementary and would love to see a course with some actual rigor!
Zone 8a - Elev.~ 1,100 ft. Sandy, OR.
Apiculture: A culmination of animal husbandry and alchemy.