BBeginner's Guide to Invading EarthBeginner's Guide to Invading Earthde Gerhard GehrkeEdiciones (1)Beginner's Guide to Invading Earth (2017)CreateSpace Independent Publishing Platform · inglés · ISBN 9781507611913Más obras de Gerhard GehrkeThe Children of MagusThe Vault of a Thousand WorldsHHouse of the Galactic ElevatorHouse of the Galactic Elevator