Search for articles in Powersearch using some examples of keywords below. Place "quotes around phrases" and once you retrieve your results use the facets (on the left) in Powersearch to narrow your search.
"digital marketing", e-commerce or ecommerce,"electronic commerce", "online advertising" or "internet advertising"
"social media", "online marketing"
In addition to PowerSearch, try the following databases to find articles in magazines and trade journals using the keywords above.