Johnson, C. (1989). Space invaders. Surey.
Lua i Stíl Chicago (17ú heag.)Johnson, Connie. Space Invaders. [Santee, Calif.]: Surey, 1989.
Lua MLA (8ú heag.)Johnson, Connie. Space Invaders. Surey, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.