APA সাইটেশন

Lansford, L., & Lewis Lansford. (2014). Unlock: Listening and speaking skills. Cambridge: Cambridge University Press.

শিকাগো স্টাইলে সাইটেশন

Lansford, Lewis, এবং Lewis Lansford. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.

এমএলএ সাইটেশন

Lansford, Lewis, এবং Lewis Lansford. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.