Our recommended citation is as follows:
CLSI. [Document Title, [edition number (eg, 1st, 2nd)] ed. CLSI [guideline, standard, or supplement [Document Code]. Clinical and Laboratory Standards Institute; [Year of Publication].
So, for AUTO15, the citation would be:
CLSI. Autoverification of Medical Laboratory Results for Specific Disciplines, 1st ed. CLSI guideline AUTO15. Clinical and Laboratory Standards Institute; 2019.