Which verb form of refer should be used to complete the following sentence in the subjunctive mood?

It is important that she ________ to the notes before taking the exam.

The verb form of refer that should be used to complete the sentence in the subjunctive mood is "refer". The correct sentence is:

It is important that she refer to the notes before taking the exam.

To complete the following sentence in the subjunctive mood, the verb form "refer" should be used in the base form or infinitive form.

For example:

"It is important that he refer to the manual before operating the machine."