Foley, M., & Hall, D. (2002). Developing Opportunities. Inglés 4º medio: Student's book (1a. ed.). Pearson Education.
Čikaški stil citiranja (17. izdanje)Foley, Mark, i Diane Hall. Developing Opportunities. Inglés 4º Medio: Student's Book. 1a. ed. Essex: Pearson Education, 2002.
MLA način citiranja (9. izdanje)Foley, Mark, i Diane Hall. Developing Opportunities. Inglés 4º Medio: Student's Book. 1a. ed. Pearson Education, 2002.
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