APA (7th ed.) Citation

Meyer-Abich, A. (1969). Alejandro de Humboldt: 1769-1969. Inter Nationes.

Chicago Style (17th ed.) Citation

Meyer-Abich, Adolf. Alejandro De Humboldt: 1769-1969. Bonn: Inter Nationes, 1969.

MLA (9th ed.) Citation

Meyer-Abich, Adolf. Alejandro De Humboldt: 1769-1969. Inter Nationes, 1969.