For most standards, the author will be the organisation setting the standard.
For most standards, the date will be the year the standard was made effective. Provide the standard number in parentheses after the title without italics.
Example:
According to the International Organization for Standardization (2018)...
OR
... (International Organization for Standardization, 2018).
Corporate author. (Year). Title (Standard Number). URL
Example:
International Organization for Standardization. (2018). Occupational health and safety management systems—Requirements with guidance for use (ISO Standard No. 45001:2018). https://www.iso.org/standard/63787.html