Definitions of refer:

• verb:   have to do with or be relevant to

  Example: "There were lots of questions referring to her talk"

• verb:   think of, regard, or classify under a subsuming principle or with a general group or in relation to another

  Example: "This plant can be referred to a known species"

• verb:   send or direct for treatment, information, or a decision

  Example: "Refer a patient to a specialist"

• verb:   seek information from

  Example: "Refer to your notes"

• verb:   have as a meaning
• verb:   make reference to