APA (7th ed.) Citation

Meyer-Abich, A., Hentschel, C., Humboldt, A. v., & Meyer, A. (1969). Alejandro de Humboldt, 1769/1969. Inter Nationes.

Chicago Style (17th ed.) Citation

Meyer-Abich, Adolf, Cedric Hentschel, Alexander von Humboldt, and Adolf Meyer. Alejandro De Humboldt, 1769/1969. Bad Godesberg: Inter Nationes, 1969.

MLA (9th ed.) Citation

Meyer-Abich, Adolf, et al. Alejandro De Humboldt, 1769/1969. Inter Nationes, 1969.