Y.K. Shikōdō (有限会社紫光堂) was a Japanese company in the mid-1950s. It was the distributor of the Stereo Leader camera in 1956; its address at the time was Chiyoda-ku Yūrakuchō 2–19 (千代田区有楽町2–19) in Tokyo.
- Asahi Camera (アサヒカメラ) editorial staff. Shōwa 10–40nen kōkoku ni miru kokusan kamera no rekishi (昭和10–40年広告にみる国産カメラの歴史, Japanese camera history as seen in advertisements, 1935–1965). Tokyo: Asahi Shinbunsha, 1994. ISBN 4-02-330312-7.