Analysis of information sources in references of the Wikipedia article "Florina (regional unit)" in English language version.
The Prefect of Florina (P. Kalligas) to Venizelos, Report No. 3394, 26 February 1930, VA File 107. His alarmist successor estimates those speaking "Bulgarian" as 75-80% of the nome's population. See the Prefect of Florina (V. Balkos) to Venizelos, 10 March 1932, WA File 110. 68.