APA

Biber D., Conrad S. & Leech G. (2008). Longman studentgrammar of spoken and written english. : Pearson education limited.

Chicago

Biber Douglas, Conrad Susan and Leech Geoffrey. 2008. Longman studentgrammar of spoken and written english. : Pearson education limited.

Harvard

Biber D., Conrad S. and Leech G. (2008). Longman studentgrammar of spoken and written english. : Pearson education limited.

MLA

Biber Douglas, Conrad Susan and Leech Geoffrey. Longman studentgrammar of spoken and written english. : Pearson education limited. 2008.