These databases are a good place to start looking for articles. JSTOR, Proquest, and Google Scholar let you find articles written by academics in various fields, e.g. history, political science, etc.
You might find some anthropology articles by using these databases. But to ensure that you're finding enough relevant articles in anthropology, you'll also need to use the anthropology-specific databases (at the right).
The main sources for identifying articles and books in Anthropology and related fields.