https://www.ckbg.org/ 2012-01-17T10:16:21+00:00 always 0.8 https://www.ckbg.org/%e2%80%98new-perspectives-on-learning-and-instruction%e2%80%99-nuovo-libro-nell-earli-book-series/ 2012-01-28T08:49:25+00:00 always 0.8