APA (7th ed.) Citation

Zetkin, C., Jones, M., & Lewis, B. (2015). Clara Zetkin: Letters and writings. Socialist Platform Ltd.

Chicago Style (17th ed.) Citation

Zetkin, Clara, Mike Jones, and Ben Lewis. Clara Zetkin: Letters and Writings. London: Socialist Platform Ltd, 2015.

MLA (9th ed.) Citation

Zetkin, Clara, et al. Clara Zetkin: Letters and Writings. Socialist Platform Ltd, 2015.