Dear Helen,
I have checked the Osprey list and again I cannot find any book on Balkan wars.
If you mean the MAA 356 Armies in the Balkans 1914-1918 unfortunately it has nothing to do with the Balkan Wars.
This is about the WW1 and not about the 1912-1913 first and 2nd Balkan wars.
The 1st Balkan war was fought between the coalition of Greece, Bulgaria, Serbia and Montenegro against Turkey and the 2nd it was a coalition of Greece, Serbia,Montenegro joined later by Romania against Bulgaria.
We had not the privilege to have Austrohungarians for example to fight within the Balkan wars. As far as I know there may be some few german advisors aiding Turkey only.
However I agree on the the other comment that the Osprey book has some nice uniforms to start with.
The balkan wars [1912-1913] was a very interesting conflict the prelude to WW1 that deserves a special book coverage by Osprey.