Introductory Handbooks
The best English-language introduction to Indo-European linguistics is Benjamin W. Fortson, Indo-European Language and Culture: An Introduction (2nd ed., Blackwell, 2009), which provides overviews of Proto-Indo-European and all the individual branches of the Indo-European family. [WID-LC P561 .F67 2009] HOLLIS record
A more theoretical approach may be found in James Clackson, Indo-European Linguistics: An Introduction (Cambridge University Press, 2007). [WID-LC P561 .C53 2007x] HOLLIS record
A user-friendly, English-based introduction to the PIE lexicon is Calvert Watkins, ed., The American Heritage Dictionary of Indo-European Roots (3rd ed., Houghton Mifflin Harcourt, 2011). [WID-LC P615 .A43 2011] HOLLIS record The same material is included as an appendix to the fifth edition of The American Heritage Dictionary of the English Language (2011). [WID-LC PE1628 .A623 2011] HOLLIS record
Reference Articles
Cowgill, W. and J. Jasanoff, "Indo-European languages," Encyclopaedia Britannica Online HOLLIS Record; full text available online [Harvard ID required]
Fortson, B. 2005. "Proto-Indo-European phonology," Encyclopedia of Language and Linguistics. 2nd ed. Amsterdam and London: Elsevier, 10, 221-228. [Widener RR 2993.20] HOLLIS Record
Fortson, B. 2005. "Proto-Indo-European syntax." In: Encyclopedia of Language and Linguistics. 2nd ed. Amsterdam and London: Elsevier, 10, 228-235. [Widener RR 2993.20] HOLLIS Record
Jasanoff, J. 2005. "Proto-Indo-European morphology," Encyclopedia of Language and Linguistics. 2nd ed. Amsterdam and London: Elsevier, 10, 213-221. [Widener RR 2993.20] HOLLIS Record
Watkins, C. 1998. "Proto-Indo-European: comparison and reconstruction," in: Anna Giacalone Ramat and Paolo Ramat (eds.), The Indo-European Languages. London and New York: Routledge, pp. 25-73. [WID-LC P561 .L5613 1998x] HOLLIS record
Watkins, C. 2003. "Indo-European languages," International Encyclopedia of Linguistics. 2nd ed. Oxford: Oxford UP. [Widener RR 2993.3] HOLLIS record; full text available online [Harvard ID required].