• Kurt Gödel. 1931. “On Formally Undecidable Propositions of Principia Mathematica and Related Systems(프린키피아 마테마티카와 관련 체계에서의 형식적으로 판정 불가능한 명제들에 관하여)”. Dover Publications.

https://monoskop.org/images/9/93/Kurt_G%C3%B6del_On_Formally_Undecidable_Propositions_of_Principia_Mathematica_and_Related_Systems_1992.pdf

• Andrew Hodges. 2000. “Alan Turing: The Enigma(앨런 튜링: 수수께끼)”. Walker Publishing.

• Daniel Kennefick. 2020. “Was Einstein the First to Discover General Relativity(아인슈타인이 일반 상대성을 처음 발견했는가)?”. 2020년 3월 9일, Princeton University Press.

https://press.princeton.edu/ideas/was-einstein-the-first-to-discover-general-relativity

• Favell Lee Mortimer. 1857. “Reading without Tears. Or, a Pleasant Mode of Learning to Read(눈물 없이 배우는 읽기: 유쾌한 읽기 학습 방법)”. Harper & Brothers.