Bord, J. (1989). Unexplained mysteries of the 20th century. New York: McGraw-Hill.
Chicago-stil citatBord, Janet. Unexplained Mysteries of the 20th Century. New York: McGraw-Hill, 1989.
MLA-referensBord, Janet. Unexplained Mysteries of the 20th Century. New York: McGraw-Hill, 1989.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.