Siegel, Carl Ludwig (1942). "Note on automorphic functions of several variables". Annals of Mathematics. Second Series. 43 (4): 613–616. doi:10.2307/1968953. JSTOR1968953. MR0008095.
archive.org
James Mill Peirce, A Text-book of Analytic Geometryat Internet Archive. The oldest citation in the 2nd edition of the Oxford English Dictionary is from 1907. The term absolute value is also used in contrast to relative value.
books.google.com
Lazare Nicolas M. Carnot, Mémoire sur la relation qui existe entre les distances respectives de cinq point quelconques pris dans l'espace, p. 105 at Google Books
Siegel, Carl Ludwig (1942). "Note on automorphic functions of several variables". Annals of Mathematics. Second Series. 43 (4): 613–616. doi:10.2307/1968953. JSTOR1968953. MR0008095.
Knuth, D. E. (1962), "Invited papers: History of writing compilers", Proceedings of the 1962 ACM National Conference, ACM Press, p. 43, 126, doi:10.1145/800198.806098
jstor.org
Siegel, Carl Ludwig (1942). "Note on automorphic functions of several variables". Annals of Mathematics. Second Series. 43 (4): 613–616. doi:10.2307/1968953. JSTOR1968953. MR0008095.