A standards citation should contain publisher, name of the standard, number, and year of publication. Edition is given only when 2nd or later edition is used.
Publisher (Year). Standard title. Place of publication: Publisher.
Finnish Standards Association SFS (2015). Quality management systems: requirements SFS-EN ISO 9001. Helsinki: Finnish Standards Association.
British Standards Institution (2008). BS EN ISO 9001: 2008 Quality management systems. Requirements. Milton Keynes: BSI.
Quality according to SFS-EN ISO 9001 is… (Finnish Standards Association SFS 2015).
According to the British standard BS 5555 on quality … (British Standards 2008).