Improve "Harvard Durham University Business School" citation style to better match the reference examples

Improve "Harvard Durham University Business School" citation style to better match the reference examples

Remove comma separator in citation (as seen in the reference document at http://www.dur.ac.uk/resources/library/teaching/writingyourbibliography.pdf)
Merge pull request #537 from terber2/patch-2

Improve "Harvard Durham University Business School" citation style to be...