Central sales tax reference amendment clarifies cross references in section nine, substituting clause reference with subsection four of section eight. Amendment clarifies a cross reference in the Central Sales Tax statute by modifying the proviso to section 9(1), substituting the specific phrase 'clause (a) of sub-section (4) of section 8' with the broader reference 'sub-section (4) of section 8,' thereby altering which portion of section 8 is invoked by the proviso and addressing internal statutory cross referencing within the taxation enactment.