Idrus, A. et al. 2011. Metamorphic Rock-Hosted Orogenic Gold Deposit Type as a Source of Langkowala Placer Gold, Bombana, Southeast Sulawesi. Indonesian Journal on Geoscience. 6, 1 (Mar. 2011), 43–49. DOI:https://doi.org/10.17014/ijog.6.1.43-49.