- ↑ Advertisement in Shoho no rajio January 1948 reproduced in Ōjima, p.4 of Camera Collectors' News no.172.
- Ōjima (大島毅). "Shidakkusu (futsu-sei) to Borekkusu (nihon-sei)" (シダックス[仏製]とボレックス[日本製], Sidax [made in France] and Bolex [made in Japan]). In Camera Collectors' News no.172 (October 1991). Nishinomiya: Camera Collectors News-sha.