@book {TN_libero_mab2,
author = { Mackin, Ronald AND Webb, John AND Scott-Buccleuch, R. L. },
title = { Opeac oral drills },
publisher = {Oxford Univ. Press},
year = {19XX-},
address = { London },
url = { http://slubdd.de/katalog?TN_libero_mab2 }
}
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