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. London: Pocket Books, 2006.

MLA (9th ed.) Citation

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

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