APA Citation

(1992). Mysteries of mankind: Earth's unexplained landmarks. Washington, D.C.: The Society.

Chicago Style Citation

Mysteries of Mankind: Earth's Unexplained Landmarks. Washington, D.C.: The Society, 1992.

MLA Citation

Mysteries of Mankind: Earth's Unexplained Landmarks. Washington, D.C.: The Society, 1992.

Warning: These citations may not always be 100% accurate.