APA (7th ed.) Citation

Keene, C. (1999). The secret of the old clock ; The hidden staircase ; The bungalow mystery. Smithmark.

Chicago Style (17th ed.) Citation

Keene, Carolyn. The Secret of the Old Clock ; The Hidden Staircase ; The Bungalow Mystery. New York: Smithmark, 1999.

MLA (9th ed.) Citation

Keene, Carolyn. The Secret of the Old Clock ; The Hidden Staircase ; The Bungalow Mystery. Smithmark, 1999.