APA (7th ed.) Citation

Marx, K., & Engels, F. (1959). Über proletarischen Internationalismus.

Chicago Style (17th ed.) Citation

Marx, Karl, and Friedrich Engels. Über Proletarischen Internationalismus. 1959.

MLA (8th ed.) Citation

Marx, Karl, and Friedrich Engels. Über Proletarischen Internationalismus. 1959.

Warning: These citations may not always be 100% accurate.