สัจพจน์เส้นขนาน (Thai Wikipedia)

Analysis of information sources in references of the Wikipedia article "สัจพจน์เส้นขนาน" in Thai language version.

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clarku.edu

"Euclid's Elements, Book I, Definition 23". Clark University. สืบค้นเมื่อ 2022-04-19. Parallel straight lines are straight lines which, being in the same plane and being produced indefinitely in both directions, do not meet one another in either direction.
"Euclid's Elements, Book I". aleph0.clarku.edu. สืบค้นเมื่อ 13 June 2023.