You can find the titles you need at https://osiris.utwente.nl/student/OnderwijsCatalogus.do 
Using the course codes mentioned in the study programme or admission letter. Once you know which books you need you can order them at a book store.

You can also get help of the study associations. The study associations will sell you books at a reduced price. For information (see below)https://www.stress.utwente.nl/study/books