Hilling, Maria (2005) - LES
Bittker, Boris and Lawrence Lokken (1989-) - L4. Westlaw: WGL-IEG.
Panayi, Christiana H. J. I. (2007) - LES
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Lexis: CASES (1875-current)
ed. by Prof. Guglielmo Maisto
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Terra, B. J. M. (2008) - LES