I have these too PDF files and I use Harvard referencing
style but I am unsure of how to reference these.
Do you have any suggestions?
Are you using the correct scheme? As a PGCE student I think you are - what advice did your lecturer give you?
http://lrweb.beds.ac.uk/guides/a-guide-to-referencing/ref
I would suggest you look at the advice here:
http://lrweb.beds.ac.uk/guides/a-guide-to-referencing/how-to-cite-non-government-reports
If you are not sure contact your Academic Liaison Librarian with some urgency
http://lrweb.beds.ac.uk/help/ALLs/Hilary_Johnson
http://lrweb.beds.ac.uk/help/ALLs/Adele_Robinson
They have created rafts of information for you on LRWeb and it would benefit you to use it
http://lrweb.beds.ac.uk/education/dont
http://lrweb.beds.ac.uk/education