Hadtápbiztosítás - 16. évf. 1. sz. (1983.)
Így roncsolja a hallásunkat az erős zaj - Patika Magazin Online
Ear Defenders: A buyer's guide to hearing protection - SHP - Health and Safety News, Legislation, PPE, CPD and Resources
Ear Defenders: A buyer's guide to hearing protection - SHP - Health and Safety News, Legislation, PPE, CPD and Resources
Ear Defenders: A buyer's guide to hearing protection - SHP - Health and Safety News, Legislation, PPE, CPD and Resources
