Aide, F., A. Gaoili & R.J. Cochico: Jatropha curcas L. (tuba) as a source of natural dye. (Philip. J. Sc. 77 (1947) 55-60). Anonymus: Bosbouw op Ceram. (Forestry in Ceram Island, Moluccas). (Econ. Weekblad v. Ned. Ind. 1947, no. 14).