Westbrook, C., & Carolyn Westbrook. (2014). Unlock: Listening and speaking skills. Cambridge: Cambridge University Press.
استشهاد بنمط شيكاغوWestbrook, Carolyn, و Carolyn Westbrook. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.
MLA استشهادWestbrook, Carolyn, و Carolyn Westbrook. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.