https://core.ac.uk/download/pdf/83544073.pdf

http://200.23.113.51/pdf/2431.pdf

https://repositoriosed.educacionbogota.edu.co/bitstream/001/1084/2/SED%20080.pdf

https://wcarpre.s3.amazonaws.com/3__El_valor_posicional_1_er_ciclo_Broitman.pdf

https://personales.unican.es/manzanom/edigitali/Apuntes/Tema_I.pdf

https://www.mineduc.gob.gt/DIGECADE/documents/Telesecundaria/Recursos%20Digitales/2o%20Recursos%20Digitales%20TS%20BY-SA%203.0/06%20MATEMATICA/U12%20pp%20281%20sistema%20binario.pdf

https://ocw.ehu.eus/pluginfile.php/42732/mod_page/content/1/Tema_1/1_5.pdf