WILLIAMS ALMA. (1984). PROJECT SKILLS & STRATEGIES. PITMAN PUBLICATIONS.
Lua i Stíl Chicago (17ú heag.)WILLIAMS ALMA. PROJECT SKILLS & STRATEGIES. LONDON: PITMAN PUBLICATIONS, 1984.
Lua MLA (9ú heag.)WILLIAMS ALMA. PROJECT SKILLS & STRATEGIES. PITMAN PUBLICATIONS, 1984.
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