APA (7th ed.) Citation

SPENCER. (1995). The encyclopedia of world's greatest unsolved mysteries. Headlines Book.

Chicago Style (17th ed.) Citation

SPENCER. The Encyclopedia of World's Greatest Unsolved Mysteries. London: Headlines Book, 1995.

MLA (8th ed.) Citation

SPENCER. The Encyclopedia of World's Greatest Unsolved Mysteries. Headlines Book, 1995.

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