Oh come on! Undergrads typically go through each one of those in a year, they're entry level because they walk you through every bit of introductory details, then rapidly move you to what was state of the art 10 years ago, with tons of citations.

I do also use them as references, but they're wholly approachable by a person who has a year to spend learning a deep topic.

Oh, I googled them quickly but misread the results. Thanks for the correction.

But I guess, if you consider them more encyclopedic than entry level, that my question still stands. Do you have any particular recommendation? You seem to be familiar with the field!