APA (7th ed.) Citation

Vavilova I. V., Voronin M. S., & Kobzeva N. A. Nadezhda Aleksandrovna. (2012). English as a world language. 2012.

Chicago Style (17th ed.) Citation

Vavilova I. V., Voronin M. S., and Kobzeva N. A. Nadezhda Aleksandrovna. English as a World Language. 2012, 2012.

MLA (9th ed.) Citation

Vavilova I. V., et al. English as a World Language. 2012, 2012.