市勢の概要2016(平成28年版)I.運輸・通信 [City Statistics (Fiscal 2016) section I Transport - Communications] (in Japanese). Japan: Iida City. 2017. Archived from the original on 2020-08-12. Retrieved 2019-03-10.
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市勢の概要2016(平成28年版)I.運輸・通信 [City Statistics (Fiscal 2016) section I Transport - Communications] (in Japanese). Japan: Iida City. 2017. Archived from the original on 2020-08-12. Retrieved 2019-03-10.