The required elements for the reference are:
Corporate author/organisation. (Year of publication) Standard number and full title of standard. Place of publication: Publisher.
Reference List
Example of the full reference at the end of your assignment:
European Committee for Standardization. (2015) CEN ISO/TS 13972:2015 Health informatics: detailed clinical models, characteristics and processes. Belgium: European Committee for Standardization.
In-text citation
Example 1 - where the author's name does not occur naturally in the sentence
CEN ISO/TS 13972:2015 states that .....(European Committee for Standardization 2015).
In-text citation
Example 2- where the author's name appears naturally in the sentence
The European Committee for Standardization (2015) states that in CEN ISO/TS 13972:2015 ...