Learning in the zone: A social constructivist framework for distance education in a 3-dimensional virtual world. Bronack, S., Riedl, R., & Tashner, J. Interactive Learning Environments, 14(3):219–232, 2006.
bibtex   
@article{bronack_learning_2006,
	title = {Learning in the zone: {A} social constructivist framework for distance education in a 3-dimensional virtual world},
	volume = {14},
	number = {3},
	journal = {Interactive Learning Environments},
	author = {Bronack, Stephen and Riedl, Richard and Tashner, John},
	year = {2006},
	keywords = {3D Virtual Worlds},
	pages = {219--232}
}

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