- http://people.umass.edu klement/pom/pom.pdf
- booksfree.org wp-content/uploads/2022/03/…
- archive.org details/principia-mathematica_202307
- en.wikipedia.org Principia Mathematica
- plato.stanford.edu archivES/FALL2017/Entries/…
- en.wikisource.org wiki/Russell_&_Whitehead's_…
- djvu.online file/pwaoCEoASLVSTPrincipia mathematica by alfred north whitehead, sc.D., f.r.s. fellow of trinity college, cambridge, professor of philosophy...Bulunamadı: расселл
- antilogicalism.com wp-content/uploads/2018/04/…Principia Mathematica: Volume III by Alfred North Whitehead & Bertrand Russell.
- ysk-books.com en/show/book/Principia-Mathematica…
- gutenberg.org files/28233/28233-pdf.pdf
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Principia Mathematica
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