Records from the T︠S︡entralen dŭrzhaven arkhiv (Central State Archives), Bulgaria, Fond 137, Opis 1.
Petur Izraelevich Gabe (1857-1927) was the Bulgarian journalist of Jewish extraction
United States Holocaust Memorial Museum https://collections.ushmm.org/search/catalog/irn514506
Contains manuscripts, notebooks, letters and newspaper clippings relating to the Jewish question, Jewish language, resettlement of Jewish families in Bulgaria, and migration of Russian Jews to agricultural colonies in Palestine.
Петър Израелевич Габе (1857–1927) - Личен фонд