PAPERBACK. Condition: Very Good. 0838517528 4th ed. Cover has some aging/shelf wear and some minor pen markings on cover, along with label and stamp of previous owner on spine/text block (respectively), but is in otehrwise great condition! Pages are in great shape, and all copy is crisp, clean, and UNMARKED. Ships fast! 100% of proceeds go towards promoting literacy in under-served areas of the world.