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If a small library aims to provide good reference service , co-operation is compulsory . I know I've found existing code to be good reference for how something needs to be done , even if I've ultimately written my own . In this course we discussed how to get the word out about your collections and how to provide good reference service to your users . I've used some the dots to indicate good reference points for positioning the image . It 's hard to perform good reference service in that kind of environment , yet we all still have to try . It is important to have good reference spectra , taken with the same instrument used for the samples , so that such small differences in peak location can be seen .