APA
Higgins J., . (2001). The Keys of Hell. New York: Borkley Books.
Chicago
Higgins Jack, . 2001. The Keys of Hell. New York: Borkley Books.
Harvard
Higgins J., . (2001). The Keys of Hell. New York: Borkley Books.
MLA
Higgins Jack, . The Keys of Hell. New York: Borkley Books. 2001.
