APA

Vavilova I. V., Voronin M. S. & Kobzeva N. A.English as a world language. : .

Chicago

Vavilova I V, Voronin M S and Kobzeva N A.English as a world language. : .

Harvard

Vavilova I. V., Voronin M. S. and Kobzeva N. A.English as a world language. : .

MLA

Vavilova I V, Voronin M S and Kobzeva N A.: . .