noah, akpan sunday (2014) “Preliminary Investigation on Production of Brown Ink from Gmelina arborea (ROXB) Fruit Extract”, International Journal of Sciences: Basic and Applied Research (IJSBAR), 18(1), pp. 297–303. Available at: https://gssrr.org/JournalOfBasicAndApplied/article/view/2132 (Accessed: 5 August 2026).