Below are sources that were used to verify bibliographic information for newspapers from Bulgaria. The first source consulted is the Library of Congress Online Catalog, but printed bibliographies also are useful. The most comprehensive print titles on this topic are the editions of Bulgarski periodichen pechat 1844-1944 and Bulgarski periodichen pechat 1944-1969, described below. For titles published after 1969, the other bibliographies below can be used to piece together some information, but no one bibliography suffices to cover the entire history of Bulgarian newspaper publishing.
Online catalogs usually are the best sources for the most current information. For Bulgaria, the most comprehensive source is the COBISS catalog External in Sofia, which is a combined online catalog of several libraries in Bulgaria, including the largest library—the National Library of Saints Cyril and Methodius.