Making Proper Marks in Books

The Zettelkasten note-taking method has made book writing and writing scientific papers easy for hundreds of years already.
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Many books by Umberto Eco are available for free downloadds at [REDACTED BY MODS]
Now in its twenty-third edition in Italy and translated into seventeen languages, How to Write a Thesis has become a classic. Of course, there was no Internet in 1977, but Eco's index card research system offers important lessons about critical thinking and information curating for students of today who may be burdened by Big Data.
Umberto Eco's book is available in an English translation:
https://www.amazon.com/How-Write-Thesis-MIT-Press/dp/0262527138/