The Intercontinental Dictionary Series. ids.clld.org
Rick Derksen. Etymological Dictionary of the Slavic Inherited Lexicon. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Jotov, M. I. & Ponomareva, N. N. (1959). Kratkij bolgarsko-russkij slovar'. Moskva: Gosudarstvennoje izdatel'stvo inostrannyx i nacional'nyx slovarej.
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This map shows the etymological links in a geographic context.