APA-viite (7. p.)
ebrary, Inc, Usó Juan, E., & Martínez Flor, A. (2006). Current trends in the development and teaching of the four language skills. M. de Gruyter.
Chicago-viite (17. p.)
ebrary, Inc, Esther Usó Juan, ja Alicia Martínez Flor. Current Trends in the Development and Teaching of the Four Language Skills. Berlin ; New York: M. de Gruyter, 2006.
MLA-viite (9. p.)
ebrary, Inc, et al. Current Trends in the Development and Teaching of the Four Language Skills. M. de Gruyter, 2006.
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