Referensi
Harden, R., and Stamper, N. (1999). What is a spiral approach to curriculum? Medical Teacher, 21(2): 141-143.
Lohani, V. K., Mallikarjunan, K., Wolfe, M. L., Wildman, T., Connor, J., Muffo, J., ... & Chang, M. (2005, October). Work in progress-spiral approach to curriculum to reformulate engineering curriculum. In Proceedings Frontiers in Education 35th Annual Conference. IEEE.
Masters, K., and Gibbs, T. (2007). The Spiral Approach: implications for online learning. BMC Medical Education, 7(52): doi:10.1186/1472-6920-7-52.
Snider, V. E. (2004). A comparison of spiral versus strand curriculum. Journal of Direct Instruction, 4(1), 29-39.
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