Sources:
http://www.space-invaders.com/
http://bavatuesdays.com/days-87-3-atari-2600-cartridges/
http://boxart.tumblr.com/search/space+invaders
http://blog.creepshop.com/zone-livre-livre-pixn-love-1/
http://www.labelmaker2600.com/samples
http://www.playfire.com/a/game/space-invaders/images
http://img.neoseeker.com/boxview.php?iid=25999&eid=49416&type=front
http://www.emuparadise.org/Atari_5200_ROMs/Space_Invaders_(1982)_(Atari)/91796
http://segaretro.org/Space_Invaders
http://switchgaming.blogspot.com/2009/10/destroy-space-invader.html
http://www.japtou.com