One of the most frequent problems we see with Interlibrary Loan Requests from Montessori students is that they did not realize that the article was not in English because the article's title was in English. Many international journals will publish the article titles and abstract/summary in English but the article text will be in a variety of different languages (Dutch, German, and Italian seem to be common for Montessori subjects).
Fortunately, it is very easy to remove non-English language content in Search at UW or limit just to the languages of your choosing. Below is an approximately 1:40 minute demonstration on how to do this in Search at UW.