It will only give you a list of leads who visited the page. What you probably want is info in the Original Source Info and Original Source Type fields. By default, these are not returned in the getLead results, but you can copy them over to a custom field using change data value flow action. All custom fields are returned, so you'll be able to extract the information in this way. Do remember that the Source Info field is likely to have the form name, not the name of the webpage. But, if you use a form on only one landing page, this mapping would be straightforward