Brinton, D. G., & Humboldt, W. (1885). The philosophic grammar of American languages, as set forth by Wilhelm von Humboldt: With the translation of an unpublished memoir by him on the American verb. Philadelphia: McCalla & Stavely.

Brinton, Daniel Garrison, and Wilhelm Humboldt. The Philosophic Grammar of American Languages, As Set Forth By Wilhelm Von Humboldt: With the Translation of an Unpublished Memoir By Him On the American Verb. Philadelphia: McCalla & Stavely, 1885.

Brinton, Daniel Garrison, and Wilhelm Humboldt. The Philosophic Grammar of American Languages, As Set Forth By Wilhelm Von Humboldt: With the Translation of an Unpublished Memoir By Him On the American Verb. Philadelphia: McCalla & Stavely, 1885.