I am suitably informed regarding citations – Open University prefers the Open University (OU) Harvard style (link to OU citation guide here).
Briefly, the format is as follows:
Author, A. A. and Other-Author, B. B. (Date) ‘Title of item’, Title of Overall Work [Item type/information], Publisher information/location from which accessed.
For this module, we are encouraged to use the same format as appears in the module study guide, and to maintain consistency throughout. Referenced in-text: (Author, YYYY). Referenced at end (‘References’):
Author, A. N. & Other-Author, A. N. (YYYY) Title of Overall Work, Location, Publisher.
A useful primer on referencing can be found here (OU library resource).