Management Accounting (2009) by Peter Atrill, Eddie McLaney
The concepts explained in Management Accounting (2009) PDF book are not the simplest ones. But however, Peter Atrill, Eddie McLaney is a higly-skilled in making such kind of material easy to understand and implement in practice.
I found this book very helpful - Peter Atrill, Eddie McLaney is a great teacher and writer. Probably Management Accounting (2009) is the one of the best on the topic
Got a PDF Kindle cversion of Management Accounting (2009) - I guess a hardcopy would be better. Peter Atrill, Eddie McLaney is a top-level prefessional