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pubmed.ncbi.nlm.nih.gov
van Alphen, A.; Halfens, R.; Hasman, A.; Imbos, T. (1994). "Likert or Rasch? Nothing is more applicable than good theory". Journal of Advanced Nursing. 20 (1): 196–201. doi:10.1046/j.1365-2648.1994.20010196.x. PMID7930122.
Armstrong, Robert (1987). "The midpoint on a Five-Point Likert-Type Scale". Perceptual and Motor Skills. 64 (2): 359–362. doi:10.2466/pms.1987.64.2.359. S2CID145705789.