Citação norma APA
ebrary, Inc, Usó Juan, E., & Martínez Flor, A. (2006). Current trends in the development and teaching of the four language skills. M. de Gruyter.
Citação norma Chicago
ebrary, Inc, Esther Usó Juan, and Alicia Martínez Flor. Current Trends in the Development and Teaching of the Four Language Skills. Berlin ; New York: M. de Gruyter, 2006.
Citação norma MLA
ebrary, Inc, et al. Current Trends in the Development and Teaching of the Four Language Skills. M. de Gruyter, 2006.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.