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Southan, G; Srinivasan, A (1998). "Nitrogen Oxides and Hydroxyguanidines: Formation of Donors of Nitric and Nitrous Oxides and Possible Relevance to Nitrous Oxide Formation by Nitric Oxide Synthase". Nitric Oxide. 2 (4): 270–86. doi:10.1006/niox.1998.0187. PMID9851368.
"Salinan arsip". Diarsipkan dari asli tanggal 2008-04-10. Diakses tanggal 2017-07-11.
web.archive.org
"Sodium Azide". Hazardous Waste Management (dalam bahasa Inggris). Northeastern University. March 2003. Diarsipkan dari asli tanggal 2007-11-04. Diakses tanggal 2017-07-11.