I am not sure who you mean by "references"
-if you are referring to writers of the Letter of Evaluation/Recommendation, which would better be described as recommenders or simply letter writers, the form that the applicants sends to letter writers to ask for a letter to be submitted to AMCAS simply generates an AAMC Letter ID. The form is not submitted to AMCAS only the letter. And only the letters, not any form, are sent from AMCAS to the schools.
-If you are referring to the contacts listed for work and activities, there is no form that they need to fill out