Lua APA (7ú heag.)

Warsawsky. (2011). Spectrum: A Communicative Course in English - Student's Book 2. Longman.

Lua i Stíl Chicago (17ú heag.)

Warsawsky. Spectrum: A Communicative Course in English - Student's Book 2. Longman, 2011.

Lua MLA (8ú heag.)

Warsawsky. Spectrum: A Communicative Course in English - Student's Book 2. Longman, 2011.

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