well it is up to the student whether o not they use the resources in the first place. it is then a choice that the student has to take and it is also a risk. this risk could be that the rescources could be incorrect, yet it could be the best thing that is out there.
however, even if you choose to take stuff ofrmt eh resources, one still has a choice of what info they get. personally i don't like the summaries that are in huge chunks. but prefer the ones that are in dot form. the essays are good as exemplars and for good ideas on how the plan of your assignment should be
at teh end of the day, it is the student's chocie whether or not they choose that stuff.