Kempgen's linguistic bibliography

This Linguistic Bibliography contains about 17.000 records relating to Slavic Linguistics and Slavic Culture with focus on East- and South Slavic Regions. The list of subjects is located here.

Your search for Butler, Th. provides 2 hits
1	The Origins of the War for a Serbian Language and Orthography Butler, Th. - in: Harvard Slavic Studies (1970) 1-80
2	Monumenta Bulgarica. A bilingual anthology of Bulgarian texts from the 9th to the 119th century Butler, Th. (ed.) - Ann Arbor, University of Michigan, 1997

Kempgen's linguistic bibliography

The Origins of the War for a Serbian Language and Orthography

Monumenta Bulgarica. A bilingual anthology of Bulgarian texts from the 9th to the 119th century