1. Pepper https://www.softbank.jp/robot/pepper/consumer/ (Browse 2019/3/12). Pepper https://www.softbank.jp/robot/pepper/consumer/ (Browse 2019/3/12).
2. Amazon Echo https://www.amazon.co.jp/dp/B071ZF5KCM/ref=cm_sw_r_cp_ep_dp_qwsMBb1HY9N14 (Browse 2019/3/12). Amazon Echo https://www.amazon.co.jp/dp/B071ZF5KCM/ref=cm_sw_r_cp_ep_dp_qwsMBb1HY9N14 (Browse 2019/3/12).
3. Google Home https://store.google.com/jp/product/google_home (Browse 2019/3/12). Google Home https://store.google.com/jp/product/google_home (Browse 2019/3/12).
4. Yasushi Terao 2012. Why does the Speech Error happen? Iwanami Shoten. Yasushi Terao 2012. Why does the Speech Error happen? Iwanami Shoten.
5. Yasushi Terao 2008. Verification of language production model by speech error data Speech Research Number 3 Vol. 12 17--27. Yasushi Terao 2008. Verification of language production model by speech error data Speech Research Number 3 Vol. 12 17--27.