τρεῖς τρία
Suggested Citation
Christopher Francese, Core Latin and Ancient Greek Vocabularies. Carlisle, Pennsylvania: Dickinson College Commentaries, 2013. ISBN: 978-1-947822-06-1.
http://dcc.dickinson.edu/pl/greek-core/%CF%84%CF%81%CE%B5%E1%BF%96%CF%82-%CF%84%CF%81%CE%AF%CE%B1