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Step 1) In order to see the keywords in the source of your lead's detail page, you need to follow these steps:
a) You need to add the code to the final URLs.
a) Link your adwords and analytics accounts. Click https://support.google.com/adwords/answer/1704341?hl=en to find out how.
Step 2) Link your adwords and analytics accounts. Here is a guide from google: