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. (2017). Construction of Gratitude Scale Using Polytomous Item Response Theory Model. In IACAT 2017 Conference. presented at the 08/2017, Niigata, Japan: Niigata Seiryo University. Retrieved from https://drive.google.com/open?id=1pHhO4cq2-wh24ht3nBAoXNHv7234_mjH