Não informado. (1960). NEC Research and Development. Nippon Electric Company.
Chicago-viite (17. p.)Não informado. NEC Research and Development. Tokyo: Nippon Electric Company, 1960.
MLA-viite (8. p.)Não informado. NEC Research and Development. Nippon Electric Company, 1960.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.