Identify the claim precisely
Write the statement you intend to use before searching for a convenient citation. Identify whether it concerns an observation, an interpretation, a policy or an estimate. Those kinds of statement may need different evidence. A source can be relevant to a topic without supporting the exact sentence beside its reference. Keep the wording narrow enough that you can ask what material would establish it and what would remain an inference of your own.
Follow the route through summaries
If you encountered a claim in a commentary or news summary, look for the original work it identifies. Compare what the summary says with what the underlying material actually reports. Record when you cannot access or verify the original rather than pretending you inspected it. A later account may provide valuable interpretation, but that is a different role from being the original observation or decision. Cite the material you actually used according to the task’s requirements.
Check version and context
Establish which version you are reading and whether the relevant passage has a correction, update or qualification. The date of a webpage and the period described by its content can differ. Check the surrounding argument before lifting a sentence into a new context. Do not assume that a familiar title means the same material across editions. Where the version matters to your claim, retain enough detail in your notes for a reader to identify it.
Examine independence
Several sources may repeat one underlying account. Do not count them automatically as separate confirmations. Ask whether they contribute independent evidence, different interpretation or merely another route to the same statement. This distinction does not make every repeated summary useless; it changes the strength of the support you can claim. Be especially careful when an impressive list of references conceals that none provides the observation, data or formal decision your sentence requires.
Keep a provenance note
For each central claim, record where you found it, the source you inspected, the passage supporting it and the limit on its use. Separate a direct quotation from your paraphrase. Store only material you are authorised to retain and do not reproduce restricted content indiscriminately. A compact note can prevent a later draft from turning a tentative finding into a universal claim simply because you no longer remember the qualification attached to the original statement.
Build a claim-to-source chain
Take one sentence from a draft and trace the route back through any summaries to the material you can legitimately inspect. At each step, identify what was added, omitted or interpreted. Revise the draft sentence to match the strongest support actually available. If a gap remains, say what you cannot establish and seek guidance rather than inventing certainty. This exercise is not a universal hierarchy in which one label always wins; it is a way to explain why a particular source is appropriate for a particular claim and where the evidential chain remains incomplete.
