APA (7th ed.) Citation

Mladenov, A., Andonov, E., & Grozev, K. (2018). The Bulgarian Air Force in the Second World War. Helion & Company Limited.

Chicago Style (17th ed.) Citation

Mladenov, Alexander, Evgeni Andonov, and Krassimir Grozev. The Bulgarian Air Force in the Second World War. Warwick, England: Helion & Company Limited, 2018.

MLA (9th ed.) Citation

Mladenov, Alexander, et al. The Bulgarian Air Force in the Second World War. Helion & Company Limited, 2018.