Go to the Advanced Search page, do your search for a key word or phrase, select the result or "match" which suits you, and then click on the Citation box. this will display the full bibliographical information for that title, the shortened URL for that paragraph which contains the result of of your key word search, and the date the page was accessed. For example, a search for "praxeological category" produces 9 matches, the first of which is from Ludwig Lachmann's Capital and its Structure. Clicking on the "Citation" button shows a box with this information in it:

You can thus cut and paste the paragraph which contains the quotation you were looking for and the accompanying citation information into any essay or article you might be writing.