<p>StrangeLight is completely correct.</p>
<p>If I were to receive a letter of recommendation from a graduate student, I would conclude that </p>
<p>1) the student applying to my program is unable to follow simple directions, since my department’s graduate program website specifies that letters must be written by professors, and </p>
<p>2) that the student applying was not well-advised by his or her own professors, since one’s professors should mentor one through the graduate admissions process, or </p>
<p>3) that the student was unable to secure appropriate letters from appropriate sources, which would lead me to conclude that the student’s graduate school plans are not supported by his/her professors.</p>