When are tutorial dialogues more effective than reading?. VanLehn, K., Graesser, A., Jackson, G., Jordan, P., Olney, A., & Rosé, C. Cognitive Science, 31(1):3-62, 2007.
When are tutorial dialogues more effective than reading? [link]Paper  bibtex   
@article{vanlehn-etal:2007cogscij,
	author = {K. VanLehn and A.C. Graesser and G.~T. Jackson and P. Jordan and A. Olney and C.P. Ros\'{e}},
	journal = {Cognitive Science},
	number = 1,
	pages = {3-62},
	title = {When are tutorial dialogues more effective than reading?},
	url = {https://sites.google.com/site/pjordansite/publications-old/VanLehn-etalCogSci2007.pdf?attredirects=0},
	volume = {31},
	year = {2007},
	bdsk-url-1 = {https://sites.google.com/site/pjordansite/publications-old/VanLehn-etalCogSci2007.pdf?attredirects=0}}

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