A Life of One's Own is a great book, far ahead of its time (she was using the word 'mindfulness' 90 years ago), and a classic in 'thinking for oneself', something that used to be popular to recommend but has never been easy to do.
Joanna Field was the pen name of Marion Milner. I have a quote from her in my profile. It took me a long time to track down the paper but that quote was the only interesting thing in it.