APA (7th ed.) Citation

Porkhunov A. A. & Suntsova E. N. (2012). Studying English: How to speak correctly. 2012.

Chicago Style (17th ed.) Citation

Porkhunov A. A. and Suntsova E. N. Studying English: How to Speak Correctly. 2012, 2012.

MLA (9th ed.) Citation

Porkhunov A. A. and Suntsova E. N. Studying English: How to Speak Correctly. 2012, 2012.

Warning: These citations may not always be 100% accurate.