1. WHO European Centre for Environment and Health: Burden of disease from environmental noise Quantification of healthy life years lost in Europe. URL:
http://www.euro.who.int/__data/assets/pdf_file/0008/136466/e94888.pdf
2. World Health Organization: Night noise guidelines for Europe. URL:
http://www.euro.who.int/__data/assets/pdf_file/0017/43316/E92845.pdf
3. Nederland Ministerie van Volkshuisvesting: Reken - en Meetvoorschrift Railverkeerslawaai (1996) URL: stillerverkeer.nl (In Dutch: Netherlands Ministry of Housing: Rail Traffic Noise Calculation and Measurement Regulations)
4. Latvijas Republikas Ministru kabinets: MK noteikumi. Nr. 16. Trokšņa novērtēšanas un pārvaldības kārtība. URL:
https://likumi.lv/ta/id/263882-troksna-novertesanas-un-parvaldibas-kartiba
(In Latvian: Cabinet of Ministers of the Republic of Latvia: Rules of Cabinet of Ministers. No. 16. Noise assessment and management procedures)
5. Latvijas Republikas Ministru kabinets: MK noteikumi. Nr. 597. Transporta enerģijas aprites cikla siltumnīcefekta gāzu emisiju daudzuma un tā samazinājuma aprēķināšanas un ziņošanas kārtība. URL:
https://likumi.lv/ta/id/301851-transporta-energijas-aprites-cikla-siltumnicefekta-gazu-emisiju-daudzuma-un-ta-samazinajuma-aprekinasanas-un-zinosanas-kartiba
(In Latvian: Cabinet of Ministers of the Republic of Latvia: Rules of Cabinet of Ministers. No. 597. Procedures for the calculation and reporting of greenhouse gas emissions and reductions in the life cycle of transport energy)