Cita APA (7a ed.)

Duncan, R. M., & Cheyne, J. A. (1999). Incidence and functions of self-reported private speech in young adults: A self-verbalization questionnaire. [s.n.].

Cita Chicago Style (17a ed.)

Duncan, Robert M., y J. Allan Cheyne. Incidence and Functions of Self-reported Private Speech in Young Adults: A Self-verbalization Questionnaire. [S.l.]: [s.n.], 1999.

Cita MLA (9a ed.)

Duncan, Robert M., y J. Allan Cheyne. Incidence and Functions of Self-reported Private Speech in Young Adults: A Self-verbalization Questionnaire. [s.n.], 1999.