This is the Vancouver style for referencing, used at the Univerity of Portsmouth within the School of Pharmacy and Biomedical Sciences and the Radiography departments.
This guide is modelled on Citing Medicine: The NLM Style Guide for Authors, Editors, and Publishers (2nd edition). You may wish to consult this source directly for additional information or examples.
Rightsholder. Title of app [Mobile application software]. (Version number). Location: Publisher. (Year). [Date accessed]. Retrieved from <download URL>
Unbound Medicine, Inc. Nursing Central [Mobile application software]. (Version 1.22) Charlottesville: Unbound Medicine, Inc. [Cited 2015 June 1]. Retrieved from <https://itunes.apple.com/us/app/nursing-central/id300420397?mt=8>