Unlu, E. A. And HATİPOĞLU, Ç. 2012. The acquisition of the copula be in present simple tense in English by native speakers of Russian. SYSTEM , vol.40, no.2 , 255-269.

Unlu, E. A., & HATİPOĞLU, Ç., (2012). The acquisition of the copula be in present simple tense in English by native speakers of Russian. SYSTEM , vol.40, no.2, 255-269.

Unlu, Elena, And ÇİLER HATİPOĞLU. "The acquisition of the copula be in present simple tense in English by native speakers of Russian," SYSTEM , vol.40, no.2, 255-269, 2012

Unlu, Elena A. And HATİPOĞLU, ÇİLER. "The acquisition of the copula be in present simple tense in English by native speakers of Russian." SYSTEM , vol.40, no.2, pp.255-269, 2012

Unlu, E. A. And HATİPOĞLU, Ç. (2012) . "The acquisition of the copula be in present simple tense in English by native speakers of Russian." SYSTEM , vol.40, no.2, pp.255-269.

@article{article, author={Elena Antonova Unlu And author={ÇİLER HATİPOĞLU}, title={The acquisition of the copula be in present simple tense in English by native speakers of Russian}, journal={SYSTEM}, year=2012, pages={255-269} }