The format for referencing PDF documents is:

Author, Year. Title of document. [type of medium] Place of publication (if available): Publisher. Followed by Available at: include web URL, where available [Accessed Date].

Barclays Bank, 2009. Earnings Report. [pdf] Barclays Bank. Available at: ,http://www.barclays.com/investors-relations/earnings-report.pdf> [Accessed 15 November 2017].