APA
Usó-Juan E., . (2001). Current Trends in the Development and Teaching of the four Language Skills. Bangolore: De Gruyter Mouton.
Chicago
Usó-Juan Esther, . 2001. Current Trends in the Development and Teaching of the four Language Skills. Bangolore: De Gruyter Mouton.
Harvard
Usó-Juan E., . (2001). Current Trends in the Development and Teaching of the four Language Skills. Bangolore: De Gruyter Mouton.
MLA
Usó-Juan Esther, . Current Trends in the Development and Teaching of the four Language Skills. Bangolore: De Gruyter Mouton. 2001.