EASTON, L. B., KLEIN, M., & ALLEN, H. B. (1984). Expresswaya: A basal language program level 6. The Economy Co.
Lua i Stíl Chicago (17ú heag.)EASTON, Lois Brown, Marvin KLEIN, agus Harold B. ALLEN. Expresswaya: A Basal Language Program Level 6. Oklahoma City: The Economy Co, 1984.
Lua MLA (9ú heag.)EASTON, Lois Brown, et al. Expresswaya: A Basal Language Program Level 6. The Economy Co, 1984.
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