APA (7th ed.) Citation

Popov, I., Anchev, N., Monov, N., & Ouzounov, N. Spreading of Malignant Neoplasms in the People's Republic of Bulgaria.

Chicago Style (17th ed.) Citation

Popov, I., N. Anchev, N. Monov, and N. Ouzounov. Spreading of Malignant Neoplasms in the People's Republic of Bulgaria.

MLA (9th ed.) Citation

Popov, I., et al. Spreading of Malignant Neoplasms in the People's Republic of Bulgaria.