Franklin

MLA

Humboldt, Wilhelm von, and Charlotte Diede. Thoughts and Opinions of a Statesman. 2d ed. London: W. Pickering, 1850.

APA

Humboldt, W. von, & Diede, C. (1850). Thoughts and opinions of a statesman. 2d ed. London: W. Pickering.

Chicago

Humboldt, Wilhelm von, and Charlotte Diede. Thoughts and Opinions of a Statesman. 2d ed. London: W. Pickering, 1850.