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• https://www.technet-21.org/en/ : global network of immunization professionals committed to strengthening immunization services by building relationships, sharing knowledge, coordinating activities, and aligning priorities and goals.
• https://www.unicef.org/supply/cold-chain-technical-support : technical guidelines on cold chain equipment and services.
• https://apps.who.int/immunization_standards/vaccine_quality/pqs_catalogue/index.aspx: WHO Performance, Quality and Safety (PQS), relevant documents, procedures, and data sheets for all currently prequalified products in the following equipment categories.
• https://www.who.int/immunization/documents/en/: Resource materials related to Immunization, Vaccines and Biologicals
• https://www.who.int/immunization/documents/training/en/: Immunization training resources

Citations 

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_{[1] Procurement Guidelines, Vaccine Carriers and Cold Boxes, 2016, UNICEF}

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