Mechtly, E.A. (January 1973). "The International System of units"(PDF). NASA-SP=7012, 1964, 1973. The reference indicates the exact conversion to cubic metres, which has been converted to 14.78676478125 ml here for convenience.
nih.gov
pubmed.ncbi.nlm.nih.gov
Dean BS, Krenzelok EP (April 1986). "Syrup of ipecac dosing ... How much is a tablespoonful?". Vet Hum Toxicol. 28 (2): 155–6. PMID2871653.