These are subheadings for primary sources published in book form. Search for these as keywords in Primo, combined with the search terms for Vikings and your assigned group.
Primo Search Box #1 Vikings
Primo Search Box #2 Native Americans OR Inuit
Primo Search Box #3 sources OR documents
OR personal narratives
If you want to extend your search beyond Primo (the Summit libraries), use the same search terms in WorldCat and order through Interlibrary Loan.