Elliott H. Berger et. al (2018). ANSI/ASA S12.71-2018. Performance Criteria for Systems that Estimate the Attenuation of Passive Hearing Protectors for Individual Users (em inglês). Melville, New York: American National Standard Institute. p. 54|acessodata= requer |url= (ajuda)link
Lempert, Barry L; Edwards, Richard G (1983). «Field Investigations of Noise Reduction Afforded by Insert-Type Hearing Protectors». Akron, Ohio: Taylor & Francis. American Industrial Hygiene Association Journal (em inglês). 44 (12): 894–902. ISSN1529-8663. PMID6660189. doi:10.1080/15298668391405913|acessodata= requer |url= (ajuda)
«Development of a new standard laboratory protocol for estimation of the field attenuation of hearing protection devices: Sample size necessary to provide acceptable reproducibility». The Journal of the Acoustical Society of America. 115: 311–23. 2004. PMID14759024. doi:10.1121/1.1633559 !CS1 manut: número-autores (link)
Gauger, D., and Berger, E. H. (2004). A new hearing protector rating: The noise reduction statistic for use with A-weighting (NRSA), Technical Report No. E-A-R 04-01/HP, American National Standards Institute, New York. This report can be found online at the following URL web URLhttp://www.e-a-r.com/pdf/hearingcons/TO4_01EPA.pdf.
en-standard.eu
Technical Committee CEN/TC 159 “Hearing protectors” (2021). EN 17479-2021. Hearing protectors - Guidance on selection of individual fit testing methods (em inglês). Brussels: European Committee for Standardization. p. 46. ISBN978 0 539 04746 2|acessodata= requer |url= (ajuda)link
Lempert, Barry L; Edwards, Richard G (1983). «Field Investigations of Noise Reduction Afforded by Insert-Type Hearing Protectors». Akron, Ohio: Taylor & Francis. American Industrial Hygiene Association Journal (em inglês). 44 (12): 894–902. ISSN1529-8663. PMID6660189. doi:10.1080/15298668391405913|acessodata= requer |url= (ajuda)
«Development of a new standard laboratory protocol for estimation of the field attenuation of hearing protection devices: Sample size necessary to provide acceptable reproducibility». The Journal of the Acoustical Society of America. 115: 311–23. 2004. PMID14759024. doi:10.1121/1.1633559 !CS1 manut: número-autores (link)
Lempert, Barry L; Edwards, Richard G (1983). «Field Investigations of Noise Reduction Afforded by Insert-Type Hearing Protectors». Akron, Ohio: Taylor & Francis. American Industrial Hygiene Association Journal (em inglês). 44 (12): 894–902. ISSN1529-8663. PMID6660189. doi:10.1080/15298668391405913|acessodata= requer |url= (ajuda)