APA সাইটেশন

(2015). The grammar files: English usage :Upper - Intermediate (CEF level B2). Tổng hợp; Công ty Nhân Trí Việt.

শিকাগো স্টাইলে সাইটেশন

The Grammar Files: English Usage :Upper - Intermediate (CEF Level B2). Tổng hợp; Công ty Nhân Trí Việt, 2015.

এমএলএ সাইটেশন

The Grammar Files: English Usage :Upper - Intermediate (CEF Level B2). Tổng hợp; Công ty Nhân Trí Việt, 2015.