References for a lab procedure

Hi,

Can anyone tell me where or how I can find the reference for a standard procedure of Iodine Index or Blue Value? This is for a testing procedure of starch-Iodine complex. Apparently, the procedure has been used here where I work for a long time, but nobody knows where they got it from. The problem is that I need to put a reference on my report that the procedure is standardized and valid.

Thanks,

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