Welcome to FEWD humanism project pages on basic sources:
The FEWD recommends to start with the Handbooks on Humanism / Secularism.
Also very usefull are the Humanist Manifestos and the following sources at
Essays in the Philosophy of Humanism, 1992-
The Humanist - A Quarterly of Ideas and Aktion, 1941-
But maybe for this project some of the most important publications you find already listed at the source pages of Bulgaria and Romania. The source pages relating to the West Balkans will be updated in the next weeks.
Special thanks goes to the CEEOL.com