Derzhanski, I.: Some Parallels between Pronouns in J.R.R. Tolkien’s and the Real World’s Languages. Arda Philology 4. ISSN 1654-5737.

Stefanov, K., B.Bontchev, E. Stefanova: Electronic forms of distance learning – a challenge even to the most experienced, Proc. of 5th Nat. Conf. in E-learning, Rousse, Bulgaria, 16-17 May, 2014, 29-35. ISBN 978-954-712-611-4