(1982). World English: Teacher's book. Washington, DC.: United states Department of state.
استشهاد بنمط شيكاغوWorld English: Teacher's Book. Washington, DC.: United states Department of state, 1982.
MLA استشهادWorld English: Teacher's Book. Washington, DC.: United states Department of state, 1982.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.