[Noah930]

As a resident or med student, there are patient rounds. Residents and students present patients (explain what has happened to them over the past 24 hours) to the team. In attendence during these rounds will be your attendings (professor doctors). They'll pimp you (ask you questions) along the way, to test your knowledge. Sometimes they'll ask you where you read whatever fact you raise. There are certain references you can cite (particular, well-regarded textbooks or journals). There are many references you cannot cite (i.e. quickie review books). Because if you were to do so, you'd get laughed off the rotation by your attendings. Back in the day of pyramidal (elimination) type residency structures, that would be a sure way to lose your job. You would not, under any circumstance, be able to say "because I read it in Wikipedia/off the internet/in Secrets (one of those quickie review books)/in People Magazine (or even Popular Mechanics)" without losing all face.