Hayden. (1956). Mastering AMERICAN ENGLISH A Handbook-Workbook of Essentials. Prentice-hall.
Lua i Stíl Chicago (17ú heag.)Hayden. Mastering AMERICAN ENGLISH A Handbook-Workbook of Essentials. Prentice-hall, 1956.
Lua MLA (8ú heag.)Hayden. Mastering AMERICAN ENGLISH A Handbook-Workbook of Essentials. Prentice-hall, 1956.
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