APA (7th ed.) Citation

Rusnak, А. I. Vitamins D, C and COVID-19. Open Systems Publication.

Chicago Style (17th ed.) Citation

Rusnak, А. I. Vitamins D, C and COVID-19. Open Systems Publication.

MLA (9th ed.) Citation

Rusnak, А. I. Vitamins D, C and COVID-19. Open Systems Publication.

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