id	domain	url
stem-7128	doi.org	http://doi.org/10.5539/elt.v10n11p96
stem-7128	dx.doi.org	http://dx.doi.org/10.17507/jltr.0803.05
stem-7128	www.classroomflip.com	http://www.classroomflip.com
stem-7128	dx.doi.org	https://dx.doi.org/10.17718/tojde.72185
stem-7128	download.atlantispress.com	https://download.atlantispress.com/article/11721.pdf
stem-7128	library.educause.edu	https://library.educause.edu/~/media/files/library/2012
stem-7128	dx.doi.org	https://dx.doi.org/10.17718/tojde.306566
stem-7128	dx.doi.org	http://dx.doi.org/10.1177/0047239516658444
stem-7128	dx.doi.org	http://dx.doi.org/10.5539/ass.v12n2p93
stem-7128	dx.doi.org	http://dx.doi.org/10.1007/s12528-016-9119-8
stem-7128	dx.doi.org	http://dx.doi.org/10.5539/res.v7n12p1333
stem-7128	doi.org	https://doi.org/10.1186/s41239-016-0032-z
stem-7128	www.christenseninstitute.org	https://www.christenseninstitute.org/wpcontent/uploads/2013/04/classifying-k-12blendedlearning.pdf
stem-7128	www.ucl.ac.uk	https://www.ucl.ac.uk/teaching-learning
stem-7128	www.informingscience.org	http://www.informingscience.org/publications/363