In List of References
Webster, J. & Flint, A. (2014). Exit interviews to reduce turnover amongst healthcare professionals.
Cochrane Database of Systematic Reviews, 2014(8), 1-28. doi: 10.1002/14651858.CD006620.pub5.
(Year of publication is also the volume number, issue number is included because each review is separately paginated)
(Webster & Flint, 2014)