APA (7th ed.) Citation

Clark, M. H. (2006). Two little girls in blue. Simon & Schuster.

Chicago Style (17th ed.) Citation

Clark, Mary Higgins. Two Little Girls in Blue. London: Simon & Schuster, 2006.

MLA (9th ed.) Citation

Clark, Mary Higgins. Two Little Girls in Blue. Simon & Schuster, 2006.

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