Briggs, P. (1969). Mysteries of our world: Unanswered questions about the continents, the seas, the atmosphere, the origins of life. McKay.
Lua i Stíl Chicago (17ú heag.)Briggs, Peter. Mysteries of Our World: Unanswered Questions About the Continents, the Seas, the Atmosphere, the Origins of Life. New York: McKay, 1969.
Lua MLA (8ú heag.)Briggs, Peter. Mysteries of Our World: Unanswered Questions About the Continents, the Seas, the Atmosphere, the Origins of Life. McKay, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.