APA (7th ed.) Citation

Keene,Carolyn. (1972). The Clue Of The Black Keys. Harper Collins Publisher.

Chicago Style (17th ed.) Citation

Keene,Carolyn. The Clue Of The Black Keys. London: Harper Collins Publisher, 1972.

MLA (9th ed.) Citation

Keene,Carolyn. The Clue Of The Black Keys. Harper Collins Publisher, 1972.

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