lHarvard Referencing a book typically goes:
[Author Surname], [Author Initial]. ([Year Published]). [Title]. ed. [City]: [Publisher], p.[Pages Used].
All you have to do is fill in the gaps:
Byrne, MM (2010). Economics and Management Sciences . Pretoria: University of South Africa. p.[Pages Used].
I don't know which pages you are referencing, so I included the template, which you can easily replace. You could always comment the pages, in which case I can do it for you.