Your syllabus is an excellent place to tell students about the research assistance offered by librarians. Inserting the following paragraph, perhaps near the information about the Rhetoric Center, will bring this service to student's attention.
Hekman Library: The library offers research assistance that may save you hours of research time and may result in a better grade. Research assistance is available most hours the library is open. You can go to the Research Assistance desk on the main floor near the entrance, call 616.526.6307, or email or IM by going to http://library.calvin.edu/services/reference_service .