Cita APA (7th ed.)
Humboldt, W., Buch, G. C., & Raven, F. A. Linguistic variability: Intellectual development.
Cita Chicago (17th ed.)
Humboldt, Wilhelm, George C. Buch, i Frithjof A. Raven. Linguistic Variability: Intellectual Development.
Cita MLA (9th ed.)
Humboldt, Wilhelm, et al. Linguistic Variability: Intellectual Development.
Atenció: Aquestes cites poden no estar 100% correctes.