《Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book)》. Cambridge: The Royal Society of Chemistry. 2014. 416, 860–861쪽. doi:10.1039/9781849733069-FP001. ISBN978-0-85404-182-4. The compound H2N-CO-NH2 has the retained named ‘urea’, which is the preferred IUPAC name, (…). The systematic name is ‘carbonyl diamide’.
Loeser, Eric; DelaCruz, Marilyn; Madappalli, Vinay (2011년 6월 9일). “Solubility of Urea in Acetonitrile–Water Mixtures and Liquid–Liquid Phase Separation of Urea-Saturated Acetonitrile–Water Mixtures”. 《Journal of Chemical & Engineering Data》 56 (6): 2909–2913. doi:10.1021/je200122b.지원되지 않는 변수 무시됨: |name-list-style= (도움말)
이기범 기자 (2011/11/4). “만들기는 쉬운데 만들 수는 없다.”. 《노컷뉴스》. 2011/11/8에 확인함.다음 날짜 값 확인 필요: |access-date=, |date= (도움말)
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Calculated from 14−pKa. The value of pKa is given as 0.10 by the CRC Handbook of Chemistry and Physics, 49th edition (1968–1969). A value of 0.18 is given by Williams, R. (2001년 10월 24일). “pKa Data”(PDF). 2003년 8월 24일에 원본 문서(PDF)에서 보존된 문서.
Calculated from 14−pKa. The value of pKa is given as 0.10 by the CRC Handbook of Chemistry and Physics, 49th edition (1968–1969). A value of 0.18 is given by Williams, R. (2001년 10월 24일). “pKa Data”(PDF). 2003년 8월 24일에 원본 문서(PDF)에서 보존된 문서.