Monopolies of Knowledge and Space/Time Bias + Hot and Cold Media Is the Message in the Global Village of the Guttenberg Galaxy

 

Harold Innis, "The Bias of Communication" from The Bias of Communication (University of Toronto Press, 2008; orig. 1951)

Eisenstein Diagram

Here are the 'notes' re: the taxonomy of Hot and Cold media.
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To get a sense of what a non-deterministic historical account of the changes brought about by the printing press:

Ben Reynolds, "The Printing Press" + "Industrial Production"
from The Coming Revolution (Zero Books, 2018)

You are not responsible for the Reynolds chapters above but they are very useful and helpful.

You are, on the other hand, responsible for this Raymond Williams critique of McLuhan, in order to be done with ol' Marshall. Even though you're never really done with him.

Raymond Williams, "The Technology and the Society" from Television: Technology and Cultural Form

Below is the Australian Broadcasting Corporation's 'Conference' program from 1977 where McLuhan discusses and responds to audience questions on his main theoretical ideas.