Source 1 would be the most reliable. This being due to the fact that it contains information about the most recent advances, which you need for your paper.
The wizard of Oz.
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-procklown
An indirect or passing reference during someone's speech is called an allusion.The allusion is designed to call something to your brain without mentioning it explicitly or directly.Its an indirect way to remind you of something.
I and III i am pretty sure that is right