APA (7th ed.) Citation

Dudley, R. H. (1955). My hobby is collecting sea shells and corals. Hart Book.

Chicago Style (17th ed.) Citation

Dudley, Ruth H. My Hobby Is Collecting Sea Shells and Corals. New York: Hart Book, 1955.

MLA (9th ed.) Citation

Dudley, Ruth H. My Hobby Is Collecting Sea Shells and Corals. Hart Book, 1955.