"School Days discontinued" (in Japanese). Kanda, Chiyoda-ku, Tokyo, Japan: 0verflow. Archived from the original on November 23, 2012. Retrieved January 7, 2012.
"Apology for Summer Days" (in Japanese). Kanda, Chiyoda-ku, Tokyo, Japan: 0verflow. Archived from the original on July 31, 2008. Retrieved January 13, 2012.
"Summer Days patches" (in Japanese). Kanda, Chiyoda-ku, Tokyo, Japan: 0verflow. Archived from the original on November 4, 2006. Retrieved January 13, 2012.
"TV animation news" (in Japanese). Kanda, Chiyoda-ku, Tokyo: 0verflow. June 1, 2007. Archived from the original on June 29, 2007. Retrieved January 7, 2012.
"Cross Days: Story" (in Japanese). Kanda, Chiyoda-ku, Tokyo, Japan: 0verflow. Archived from the original on December 15, 2012. Retrieved January 13, 2012.
Hanley, Andy (June 8, 2009). "Anime Review: School Days". UK Anime Network. Archived from the original on February 22, 2013. Retrieved August 26, 2016.
Julián Carrera (November 17, 2019). "What are Visual Novels?". Electra Street. Archived from the original on September 20, 2020. Retrieved October 11, 2020.
Hanley, Andy (June 8, 2009). "Anime Review: School Days". UK Anime Network. Archived from the original on February 22, 2013. Retrieved August 26, 2016.
Julián Carrera (November 17, 2019). "What are Visual Novels?". Electra Street. Archived from the original on September 20, 2020. Retrieved October 11, 2020.
"School Days discontinued" (in Japanese). Kanda, Chiyoda-ku, Tokyo, Japan: 0verflow. Archived from the original on November 23, 2012. Retrieved January 7, 2012.
"サマー・ラディッシュ・バケーション!! 2". Getchu.com (in Japanese). Archived from the original on July 18, 2012. Retrieved December 17, 2021.
"Summer Days: FAQ" (in Japanese). Kanda, Chiyoda-ku, Tokyo, Japan: 0verflow. Archived from the original on July 18, 2012. Retrieved December 26, 2012.
"Apology for Summer Days" (in Japanese). Kanda, Chiyoda-ku, Tokyo, Japan: 0verflow. Archived from the original on July 31, 2008. Retrieved January 13, 2012.
"Summer Days patches" (in Japanese). Kanda, Chiyoda-ku, Tokyo, Japan: 0verflow. Archived from the original on November 4, 2006. Retrieved January 13, 2012.
"Cross Days: Story" (in Japanese). Kanda, Chiyoda-ku, Tokyo, Japan: 0verflow. Archived from the original on December 15, 2012. Retrieved January 13, 2012.
"TV animation news" (in Japanese). Kanda, Chiyoda-ku, Tokyo: 0verflow. June 1, 2007. Archived from the original on June 29, 2007. Retrieved January 7, 2012.