Cita APA (7a ed.)

Harris, K. R. (1990). Developing self-regulated learners: The role of private speech and self-instructions. [s.n.].

Cita Chicago Style (17a ed.)

Harris, Karen R. Developing Self-regulated Learners: The Role of Private Speech and Self-instructions. [S.l.]: [s.n.], 1990.

Cita MLA (9a ed.)

Harris, Karen R. Developing Self-regulated Learners: The Role of Private Speech and Self-instructions. [s.n.], 1990.