BARRALL, I. 2004. Powerbase elementary: Teacher's book. 2nd ed. Harlow: Pearson Education Limited.
Citace podle APA (7th ed.)Barrall, I. (2004). Powerbase elementary: Teacher's book (2nd ed.). Pearson Education Limited.
Citace podle Chicago (17th ed.)Barrall, Irene. Powerbase Elementary: Teacher's Book. 2nd ed. Harlow: Pearson Education Limited, 2004.
Citace podle MLA (9th ed.)Barrall, Irene. Powerbase Elementary: Teacher's Book. 2nd ed. Pearson Education Limited, 2004.
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