APA

Grozdanova L. A., Georgieva M. K. & Nedkova M. (2001). Challenges in a World of English - 1. : .

Chicago

Grozdanova Liljana Aleksandrova, Georgieva Marija Kostadinova and Nedkova Marieta. 2001. Challenges in a World of English - 1. : .

Harvard

Grozdanova L. A., Georgieva M. K. and Nedkova M. (2001). Challenges in a World of English - 1. : .

MLA

Grozdanova Liljana Aleksandrova, Georgieva Marija Kostadinova and Nedkova Marieta. Challenges in a World of English - 1. : . 2001.