* {{citeCite book|first=Carl Darling|last=Buck| title=Comparative Grammar of Greek and Latin|location=Chicago|publisher=University of Chicago Press|year=1933|isbn=0-226-07931-7| ref = harv}}
* {{citeCite book|last1=Hoffner|first1=Harry A., Jr.|last2=Melchert|first2=H. Craig|title=A Grammar of the Hittite Language, 1: Reference Grammar|publisher=Eisenbrauns|year=2008|isbn=1-57506-119-8| ref = harv}}
* {{citeCite book|first=Rudolf|last=Thurneysen|title=A Grammar of Old Irish|publisher=Colton Book Imports|edition=Rev Enl Re|year=1990 (1946)|isbn=1-85500-161-6| ref = harv}}
* {{citeCite book|first=William Dwight|last=Whitney| title=Sanskrit Grammar|publisher=Harvard University Press|year=1889|isbn=81-208-0621-2 (India), ISBN 0-486-43136-3 (Dover, US)| ref = harv}}
