1. "Okra for Processing Grades and Standards", https://www.ams.usda.gov/grades-standards/okra-processing-grades-and-standards, Accessed on 14th Aug 2019.
2. "Okra for Processing-Inspection Instructions", https://www.ams.usda.gov/sites/default/files/media/Okra_for_Processing_Inspection_Instructions%5B1%5D.pdf, June 1966.
3. "Global Industrial Potato Graders Market 2018-2022", https://www.technavio.com/report/global-industrial-potato-graders-market-analysis-share-2018.
4. Dharm Veer Jajoria, "An economic analysis of okra cultivation in Punjab", https://pdfs.semanticscholar.org/b629/2cb499840a2b4790e14c49c44806c50df80c.pdf
5. "Real-time Market Prices of Okra", https://www.tridge.com/intelligences/okra/price