Não informado. (1977). STUDIES IN SECOND LANGUAGE ACQUISITION. Indiana University.
Chicago-referens (17:e uppl.)Não informado. STUDIES IN SECOND LANGUAGE ACQUISITION. Bloomington, Ind: Indiana University, 1977.
MLA-referens (8:e uppl.)Não informado. STUDIES IN SECOND LANGUAGE ACQUISITION. Indiana University, 1977.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.