If you need materials not available in the BU Library, you may request them through a service called interlibrary loan. Because the LIbrary may not request material it already owns, check carefully before submitting a request so your request is not returned to you.
Most of the Library's databases and Google Scholar link to ILLiad and will prefill your request form. Look for the 'Check Availability' link and login with your HuskyID and password. The service is free to all current BU students, staff, and faculty.
For questions ask a librarian or view the Interlibrary Loan page of the Andruss Library website.