The blue manual and the copyright section on the website of the HAN Study Centers are your sources for correct literature references. If you still have questions, there is a 3rd helpline: the Copyright Information Point (AIP). You can always send an email with your question, usually you will receive an answer the same day.
Robert Benjamins (Robert.Benjamins@han.nl) and Daan Marcellis (Daan.Marcellis@han.nl) are the Informationspecialists International Social Work and your contact for information literacy.