The book mentioned in article L. 123-28 distinguishes cash payments from other payments and indicates the references of the supporting documents.
The register referred to in the same article shall show details of purchases in chronological order, distinguishing between cash payments and indicating the references of the supporting documents.
Documents in electronic form may take the place of the book and register referred to in article L. 123-28; in this case, they shall be identified and dated as soon as they are drawn up by means offering every guarantee of proof.