Here are a few databases to begin your research:
Once you have identified your topic, check to see if it is too specific, if it is, work toward a general focus. This will help you generate a list of keywords, or concepts related to your topic.
travel, tourism, e-commerce, "mobile devices", smartphones, United States,vacations, digital travel, etc....
Use AND, OR, NOT to connect your phrases/keywords
to locate both smartphones AND travel
to locate either word U.S. OR United States
to locate (the first word) vacation NOT trip
* truncation symbol
travel* travels, travelers, traveling, traveled
Here are a few databases to locate Case Studies: