APA

Jacks L. P., . (1930). The inner sentinel: a study of ourselves and of something more. New York and London: Harper & brothers.

Chicago

Jacks L P, . 1930. The inner sentinel: a study of ourselves and of something more. New York and London: Harper & brothers.

Harvard

Jacks L. P., . (1930). The inner sentinel: a study of ourselves and of something more. New York and London: Harper & brothers.

MLA

Jacks L P, . The inner sentinel: a study of ourselves and of something more. New York and London: Harper & brothers. 1930.