APA (7th ed.) Citation

Clark, M. H. (2006). Two little girls in blue. Pocket Books.

Chicago Style (17th ed.) Citation

Clark, Mary Higgins. Two Little Girls in Blue. New York, NY: Pocket Books, 2006.

MLA (8th ed.) Citation

Clark, Mary Higgins. Two Little Girls in Blue. Pocket Books, 2006.

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