Title: Petŭr Beron; izsledvanii︠a︡ i materiali.
Authors: Gechev, M. M.; Pedagogicheski institut (Bŭlgarska akademii͡a na naukite)
Publisher: Bŭlgarska akademii︠a︡ na naukite,
Year: 1962
Subjects: Beron, Petŭr