APA (7th ed.) Citation

Humboldt, W. v., & Buck, G. C. (1972). Linguistic variability & intellectual development. University of Pennsylvania Press.

Chicago Style (17th ed.) Citation

Humboldt, Wilhelm von, and George C. Buck. Linguistic Variability & Intellectual Development. Philadelphia: University of Pennsylvania Press, 1972.

MLA (9th ed.) Citation

Humboldt, Wilhelm von, and George C. Buck. Linguistic Variability & Intellectual Development. University of Pennsylvania Press, 1972.