பேயர் – டிரிவ்சன் கருநீலத் தொகுப்பு வினை (Tamil Wikipedia)

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Adolf Baeyer, Viggo Drewsen (1882). "Darstellung von Indigblau aus Orthonitrobenzaldehyd". Berichte der deutschen chemischen Gesellschaft 15 (2): 2856–2864. doi:10.1002/cber.188201502274.
Helmut Schmidt (1997). "Indigo – 100 Jahre industrielle Synthese". Chemie in unserer Zeit 31 (3): 121–128. doi:10.1002/ciuz.19970310304.
Elmar Steingruber "Indigo and Indigo Colorants" Ullmann's Encyclopedia of Industrial Chemistry 2004, Wiley-VCH, Weinheim. எஆசு:10.1002/14356007.a14_149.pub2 10.1002/14356007.a14_149.pub2