Não informado. (2001). European Psychologist. Hogrefe & Huber Publishers.
Lua i Stíl Chicago (17ú heag.)Não informado. European Psychologist. London: Hogrefe & Huber Publishers, 2001.
Lua MLA (8ú heag.)Não informado. European Psychologist. Hogrefe & Huber Publishers, 2001.
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