What is a group whose values, norms, and beliefs come to serve as standard for one's own behavior:

Reference group.

Explanation:

A reference is something to follow, is serves as a guide, or to look up on. Humans depend and need social reference in order to act. A reference group would be a group by which characteritics would most definelty serve as an example on how to act or behave.

A reference group is found around a person's environment, it is made of people that are close to a person's life and are part of it.