The Intellectual Life: Its Spirit, Conditions, Methods by Antonin Sertillanges and Mary Ryan

First published in 1920, The Intellectual Life has been repeatedly reprinted and continues to inspire and instruct young scholars.

the Imitation for the intellectual vocation, yet also an entirely practical handbook. contains the most profound chapter on notetaking.

Pretty OK! It's half manual for structuring one's life as an intellectual, half love poem to Thomas Aquinas. I did a lot of skimming if I saw the word “God” on the page more than three times. There's lots of good, actionable advice in here (as well as lots of bad, vague advice – thankfully it seems easy enough to separate the wheat from the chaff).