APA

Clark M. H., . (1977). A stranger is watching. New York: Simon and Schuster.

Chicago

Clark Mary Higgins, . 1977. A stranger is watching. New York: Simon and Schuster.

Harvard

Clark M. H., . (1977). A stranger is watching. New York: Simon and Schuster.

MLA

Clark Mary Higgins, . A stranger is watching. New York: Simon and Schuster. 1977.