MLA
Liu, Jun, et al. "Ranking the Difficulty Level of the Knowledge Units Based on Learning Dependency." IJDET vol.10, no.1 2012: pp.31-43. http://doi.org/10.4018/jdet.2012010102
APA
Liu, J., Sha, S., Zheng, Q., & Zhang, W. (2012). Ranking the Difficulty Level of the Knowledge Units Based on Learning Dependency. International Journal of Distance Education Technologies (IJDET), 10(1), 31-43. http://doi.org/10.4018/jdet.2012010102
Chicago
Liu, Jun, et al. "Ranking the Difficulty Level of the Knowledge Units Based on Learning Dependency," International Journal of Distance Education Technologies (IJDET) 10, no.1: 31-43. http://doi.org/10.4018/jdet.2012010102
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