correction
I am correcting the Serbian OOB given by Oksel. I guess it can't do any harm.
Serbia was divided into 5 divisional areas (if you don't count the territory gainedin the Balkan Wars) - Dunavska, Drinska, Sumadijska, Moravska and Timocka. Each area was giving two inf divisions - class I division with soldiers age 21-31 and class II division with soldiers age 31-38. Olders were class III, but weren't forming divisions. There was one cav division (Konjicka). Because the number of recruits was bigger than the number needed to fill these units, additional were formed - Kombinovana (combined) divizija class I, "odreds" of various size - in average, 3 or 4 odreds matched 1 division. The armies were as follows:
1st Army, located south of Belgrade: Timocka division class I, Timocka II, Dunavska II, Moravska II, Konjicka.
2nd Army, located near Arandjelovac: Dunavska I, Moravska I, Sumadijska I, Kombinovana I.
3rd Army, located near Valjevo: Drinska I, Drinska II, 3 class I puks (brigades), 2 class III puks, Obrenovacki, Sabacki, Loznicki, Jadarski and Ljubovijski odred.
Uzice Army, located near Uzice: Sumadijska II, Uzicka brigada, Limski odred.
Vardarska, Bregalnicka, Ibarska and Kosovska divs weren't formed in 1914. The first two were formed in 1915.