Unghi de paralelism (Romanian Wikipedia)
Analysis of information sources in references of the Wikipedia article "Unghi de paralelism" in Romanian language version.
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archive.org
- en Nikolai Lobacevski (1840) G. B. Halsted translator (1891) Geometrical Researches on the Theory of Parallels, link from Google Books, p. 13
- en Bonola, Roberto (). Non-Euclidean geometry : a critical and historical study of its developments
(ed. Unabridged and unaltered republ. of the 1. English translation 1912.). New York, NY: Dover. ISBN 0-486-60027-0.
