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1par Leach Robert
Prentice Hall 1996Livre -
2par Leach Robert
Routledge impr. 2008Livre -
3Livre
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4par Stead Richard, Stewart Gerry, Powell Mel, Parker David, Leach Robert M., Sutherland John, Karran Terence, Henderson Roger, Burden Tom
Simon and Schuster 1989Livre -
5par Griffiths Simon
Palgrave 2018Livre