Area of a circle (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Area of a circle" in English language version.

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Stewart, James (2003). Single variable calculus early transcendentals (5th. ed.). Toronto ON: Brook/Cole. pp. 3. ISBN 0-534-39330-6. However, by indirect reasoning, Eudoxus (fifth century B.C.) used exhaustion to prove the familiar formula for the area of a disk: $A=\pi r^{2}.$
Hill, George. Lessons in Geometry: For the Use of Beginners, page 124 (1894).
Martzloff, Jean-Claude (2006). A History of Chinese Mathematics. Springer. p. 281. ISBN 9783540337829.