Hyperbolic triangle (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Hyperbolic triangle" in English language version.

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archive.org

Martin, George E. (1998). The foundations of geometry and the non-Euclidean plane (Corrected 4. print. ed.). New York, NY: Springer. p. 433. ISBN 0-387-90694-0.

Needham, Tristan (1998). Visual Complex Analysis. Oxford University Press. p. 270. ISBN 9780198534464.
Ratcliffe, John (2006). Foundations of Hyperbolic Manifolds. Graduate Texts in Mathematics. Vol. 149. Springer. p. 99. ISBN 9780387331973. That the area of a hyperbolic triangle is proportional to its angle defect first appeared in Lambert's monograph Theorie der Parallellinien, which was published posthumously in 1786.

Stothers, Wilson (2000), Hyperbolic geometry, University of Glasgow, interactive instructional website