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WikiPedia: ลูกโซ่ความเย็น http://www.rfidjournal.com/article/articleview/335... http://www.ams.usda.gov/AMSv1.0/getfile?dDocName=S... http://crosstree.info/Documents/Care%20of%20F%20n%... http://history.amedd.army.mil/booksdocs/wwi/commun... //doi.org/10.1002%2Fpts.521 http://www.fao.org/documents/card/en/c/ca6122en http://www.msthalloffame.org/frederick_mckinley_jo... https://books.google.com/books?id=93SDBwAAQBAJ&pg=... https://www.nytimes.com/2020/12/15/business/cold-s... https://www.scientificamerican.com/article/the-cov...