APA (7th ed.) Citation

Serdiuk, O. S., & Petrova, I. P. (2020). Theoretical Causes of the Problem of External Effects.

Chicago Style (17th ed.) Citation

Serdiuk, O. S., and I. P. Petrova. Theoretical Causes of the Problem of External Effects. 2020.

MLA (8th ed.) Citation

Serdiuk, O. S., and I. P. Petrova. Theoretical Causes of the Problem of External Effects. 2020.

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