Keller, D. P. (1987). Interactions I: A speaking activities book. United States: Macmillan Pub Co.
Chicago-stil citatKeller, Deborah Poole. Interactions I: A Speaking Activities Book. United States: Macmillan Pub Co, 1987.
MLA-referensKeller, Deborah Poole. Interactions I: A Speaking Activities Book. United States: Macmillan Pub Co, 1987.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.