MATH

https://eclass.uoa.gr/modules/document/file.php/MATH597/Dale%20Varberg%2C%20Edwin%20J.%20Purcell%2C%20Steve%20E.%20Rigdon%20-%20Calculus%20Early%20Transcendentals_%20Pearson%20New%20International%20Edition%20%282013%2C%20Pearson%29%20-%20libgen.lc.pdf

https://spada.uns.ac.id/pluginfile.php/146458/mod_resource/content/1/Calculus%20%28%20Ninth%20Edition%20%29%20-%20Varberg%2C%20Purcell%2C%20Rigdon.pdf

https://www.cimat.mx/ciencia_para_jovenes/bachillerato/libros/[Purcell,Varberg,Rigdon]Calculo/[Purcell,Varberg,Rigdon]Calculo.pdf