?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aulast=Sihombing&rft.aufirst=Geertruida&rft.au=Sihombing%2C+Geertruida&rft.title=An+Exploratory+Study+on+Three+Synthetic+Colouring+Matters+Commonly+Used+as+Food+Colours+in+Jakarta&rft.inst=Badan+Penelitian+dan+Pengembangan+Kesehatan&rft.date=1978