I can't read the desired specific text passages with page information from your PDFs right now because the document tool only reports: “Previously, rag was performed on the attachments...” and does not return any content/pages to me.

As a safe alternative, I can (a) mark for you exactly which statements in your “initial situation and problem breakdown” should typically be supported by principles of controlling and cost accounting principles, and (b) then prepare the short document form for you in accordance with your citation guideline — as soon as you give me the relevant PDF pages (screenshots or copy/paste), I will use them to create clean, citable documents with page numbers.