Heisei 28 Nen Jyoho Tsushin Media no Riyou Jikan to Jyoho Koudou ni Kansuru Chosa [Research for the Length of Time and Behavior to Use Communication Media]., 2017.

Tsushin Riyou Dokou Chosa [Research for the Use of Telecommunication]., 2016.

Yahoo Co., Ltd. ni okeru Shin Konkoukoku Service ni tsuite [Press release: The Adver-tisement Service Provided by Yahoo Japan Co., Ltd.]., 2012.