You have already posted many useful sites for teachers of English. How about books?

Do you know of any helpful books on the subject of effective teaching like, for example: Learning teaching by Scrivener. I also heard about Penny Ur "A Course in Language Teaching"

So, which books do you recommend?
The only one worth re-reading:

Principles and Practice in Second Language Acquisition, by Stephen D Krashen.

Hello everyone, some days ago I found a series of book from Lewis Foreman (https://www.litres.ru/lewis-foreman/). This books consist of a little story with a wide range words, recommend for all levels