I had been checking music stores and the net for a good chord reference material. I found plenty of those 10000 or a million chords books, which seems to be very useful for professional musicians, but unfortunately were too complicated for such a beginner and "weekend" guitar player like me.
Then I found this booklet, which was 8 pages long, but it seemed quite complete and very simply to follow and understand.
We basically have chord diagrams with four types of A chords, four types of E chords, four types of D chords, etc... We have the most common and used 48 chords, and an interesting aspect is that it always tells you which chords go well with other chords.
It means that you can learn the chords by simply copying the diagrams and then create your chord progression for a song you want to compose. A very useful tool to compose your first songs for acoustic or electric guitar.
There is also a guide for chord progressions, in case you don't even want to create your own and just want to follow instructions and learn new things.
I am sure there must be more complete books around, but if you basically want to learn a few more chords, learn about chord progressions and maybe compose your first songs, this cheap booklet is almost a must.
This booklet is rightly priced, it contains valuable info and is presented in a simply to understand format. Maybe later I will go for a more complete book on chords, with all those thousands of chords, but right now I am very happy with my choice!