Keller, D. P. (1987). Interactions I: A speaking activities book. United States: Macmillan Pub Co.
Chicago Style citaatKeller, Deborah Poole. Interactions I: A Speaking Activities Book. United States: Macmillan Pub Co, 1987.
MLA citatieKeller, Deborah Poole. Interactions I: A Speaking Activities Book. United States: Macmillan Pub Co, 1987.
Let op: Deze citaties zijn niet altijd 100% accuraat.