APA (7th ed.) Citation

Kopytko, B. I., Osypchuk, M. M., & Dorohovtsev, A. A. (2017). Mykola Ivanovych Portenko (on his 75th birthday).

Chicago Style (17th ed.) Citation

Kopytko, B. I., M. M. Osypchuk, and A. A. Dorohovtsev. Mykola Ivanovych Portenko (on His 75th Birthday). 2017.

MLA (8th ed.) Citation

Kopytko, B. I., et al. Mykola Ivanovych Portenko (on His 75th Birthday). 2017.

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