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![Cover for Leonard A. Annetta · V-Learning: Distance Education in the 21st Century Through 3D Virtual Learning Environments (Paperback Book) [2010 edition] (2014)](https://imusic.b-cdn.net/images/item/original/022/9789400791022.jpg?leonard-a-annetta-2014-v-learning-distance-education-in-the-21st-century-through-3d-virtual-learning-environments-paperback-book&class=scaled&v=1523563637)
![Cover for Leonard A. Annetta · V-Learning: Distance Education in the 21st Century Through 3D Virtual Learning Environments (Hardcover Book) [2010 edition] (2010)](https://imusic.b-cdn.net/images/item/original/209/9789048136209.jpg?leonard-a-annetta-2010-v-learning-distance-education-in-the-21st-century-through-3d-virtual-learning-environments-hardcover-book&class=scaled&v=1523563986)