Wataru Matsumoto,"Relation between Nonresponse Error and the Return Timing of Questionnaires :Unit Nonresponse and Item Nonresponse in the Takatsuki Citizen Mail Survey by Takatsuki City and Kansai University", RISS Discussion Paper Series, No.113.

Wataru Matsumoto（2024）, "Relation between Nonresponse Error and the Return Timing of Questionnaires:Unit Nonresponse and Item Nonresponse in the Takatsuki Citizen Mail Survey by Takatsuki City and Kansai University", RISS Discussion Paper Series, No.113.

https://www.kansai-u.ac.jp/riss/en/output/paper/