Download one of the sample letters below and personalize it for your school or district. Download a proof of residency letter template for family members, notarized or non-notarized, tailored for legal use.This resource covers the parts of the basic business letter and provides three sample business letters. Letters of recommendation give us a more personal view of you as a student and offer insight that can't be gleaned through grades and scores. Letters of recommendation give us a more personal view of you as a student and offer insight that can't be gleaned through grades and scores. You may download the comprehensive Policy and Practice Guide, which contains all of the information from this page in a single document at the link below. CASPA recommendation letter samples can be an excellent resource for applicants. Letters of recommendation are one of the most important PA school requirements. How to send letters, books, photos, and more to incarcerated individuals in Pennsylvania.