Eiseley, L. The Invisible pyramid. Charles Scribner-s Sons.
Lua i Stíl Chicago (17ú heag.)Eiseley, Loren. The Invisible Pyramid. Charles Scribner-s Sons.
Lua MLA (8ú heag.)Eiseley, Loren. The Invisible Pyramid. Charles Scribner-s Sons.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.