Zen and the Art of Motorcycle Maintenance comes to mind, I suppose also the business-parable style books like Who Moved My Cheese?.

If you count Zen and the Art of Motorcycle Maintenance, almost any fiction book with a philosophical angle would fit that description.

Or even books like “The Phoenix(/Unicorn) Project”.

	▲	threetonesun 4 hours ago \| parent [-]
		I wouldn't say any fictional book with a philosophical angle fits, but ones that could have been written as non-fiction but for the purposes of getting the point across weren't. Phoenix/Unicorn Project are good examples!