Type books

The processes of type design

I've been eager to join this forum. This has been a really helpful source of information for the last years.

I am trying to find a book about type design focusing on the process of designing a font. That is, since the catalyst or the idea, to the first primitive sketches, through the processes of adjusting and choosing the best forms for specific letters, designing alternates, etc. I am more interested in understanding how type designers "think" than the results they achieve.

Can any one point me in some direction?
After a quick search, I couldn't find any reference to such a book in Typophile. If this is a repost, I apologise.

Thank you!