کتاب های R.s.p. Beekes.
A Grammar of Gatha-Avestan (Asian Studies)
Robert S. P. Beekes, 1997
Comparative Indo-European linguistics : an introduction
R. S. P. Beekes, 1995
Comparative Indo-European Linguistics: An introduction
Prof. Robert S.P. Beekes, 2011
Comparative Indo-European Linguistics: An Introduction (2nd ed)
Robert S. P. Beekes (Revised, 2011
Etymological Dictionary of Greek (vols. 1 & 2)
Robert Steven Paul Beekes, 2010
Pre-Greek: Phonology, Morphology, Lexicon
Robert S. P. Beekes, 2014
The Development of the Proto-Indo-European Laryngeals in Greek
Robert Stephen Paul Beekes, 1969,2012
