1. Anonymous. Review of experiments on fiber-producing plants. Philippine Agr. Rev.18: 143–149. 1925.
2. Adbur Rahman Khan, Khan Sahib. A new type of roselle hemp. Agro. Jour. India25: 210–212. 1930.
3. Beattie, J. H. Production of roselle. U. S. Dept. Agr., Lft. 139. 1937,
4. Bolhuis, G. G. Bloeiwaarnemingen bijHibiscus Sabdariffa L. enHibiscus cannabinus L. Landbouw16: 404–412. 1940.
5. Calvino, Mario. El sereni textil(Hibiscus Sabdariffa, var.altissima). Cuba. Estac. Expt. Agron. Informe, 1918-20, pp. 478–482. 1920.