APA

Blass L., Hartmann P., . (2007). Quest 1: listening and speaking. New York: McGraw-Hill.

Chicago

Blass Laurie, Hartmann Pamela, . 2007. Quest 1: listening and speaking. New York: McGraw-Hill.

Harvard

Blass L., Hartmann P., . (2007). Quest 1: listening and speaking. New York: McGraw-Hill.

MLA

Blass Laurie, Hartmann Pamela, . Quest 1: listening and speaking. New York: McGraw-Hill. 2007.