Who or what recommended the book to me?

I can very well imagine that this feature was also already desired. Nevertheless, I propose it here once again and put it up for discussion.
I would like to have a field in which I could note from whom, or where I got the recommendation, or the reference for the book.
This could be a person, an organization like LT or a library, etc. For organizations like bookstores, libraries socialmedia which already have links in LT could also be linked to.
I would also like to see the feature as I have fields like Comments,
Private comments, Summary etc already use for other private notes.

Nothing says you can't include this in tags, comments, or an additional line in private comments. Probably why it has never been added as a dedicated field.

I very much doubt a dedicated field is likely to happen if it doesn't benefit from dedicated field in the sense of database manipulation. If it fits perfectly well in one of the freeform fields, I wouldn't hold my breath waiting for it to happen and would pick one of those or tags to keep track, probably tags as it makes it easy to pull all recs by someone if you want.

I think most of us have a preferred field we think LT should have. Mine is 'Date discarded'. I have no real objection to you getting yours, as long as I get mine first. If Tim granted all of these the database would be out of control.

I have used tags for this purpose and find it works well for me. All start with "recommended by " so they can easily be searched and sorted. I also use "get rid of it" and "got rid of it" for discards (and move them out of the My Library collection). Those would easily extend with a date in the same way.

In fact, I will add that I think tagging is pretty much the most useful thing on LT and I wish other sites would offer it.

>6 sarahemmm: Ditto!

Judging by your answers, my idea doesn't seem to have been a good one.

I can understand the argument of >4 MarthaJeanne: very well. If all user wishes were taken into account, where would that lead to?

This leads to another possibility to solve wishes of this kind for everyone. At least in a limited way. And if I'm not mistaken, the following suggestion has already been made.
How about if LT allowed each user three (the number can of course be discussed) user fields for their own use? With your own heading and a comment field.

Types such as date/time, text, lists, calculation fields in which simple arithmetic operations can be performed with other numeric data are available.

Does this suggestion resonate more in LT?

We have two free fields: comments and private comments. You can use them for whatever you want.

>8 birder4106: It isn't so much what resonates with others as what is realistic to expect. I am not a programmer but even basic reasoning tells you that coding a field that would at the same time be free form, enabling you to enter all sorts of data, and perform database functions of calculating what's in those fields, is most likely impossible.

RSIs are not often implemented and when they are, it's often when developers work on that part of the code anyway, so my advice would be to bring this up when catalogue is being LT 2.0-ified. At the very least, you'll get a response about feasibility of it from Tim et. al (or desirability of simpler initial one)