APA

Hollingworth H. L., . (1949). Psychology and ethics: a study of the sense of obligation. New York: Ronald.

Chicago

Hollingworth Harry Levi, . 1949. Psychology and ethics: a study of the sense of obligation. New York: Ronald.

Harvard

Hollingworth H. L., . (1949). Psychology and ethics: a study of the sense of obligation. New York: Ronald.

MLA

Hollingworth Harry Levi, . Psychology and ethics: a study of the sense of obligation. New York: Ronald. 1949.