Não informado. Philips Research Reports. Philips Research Laboratories.
Chicago-viite (17. p.)Não informado. Philips Research Reports. Eindhoven, Holanda: Philips Research Laboratories.
MLA-viite (8. p.)Não informado. Philips Research Reports. Philips Research Laboratories.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.