http://cesire.cat.mialias.net/recursos/context/biologia/Tema_2/funcionament_del_microscopi_ptic.html
http://ca.wikipedia.org/wiki/Microscopi
https://botanica.cnba.uba.ar/Trabprac/Tp1/microscopio.html
http://www3.udg.edu/publicacions/vell/electroniques/Diagnostic_Histologic_Animal/bloc/bloc1/1.2_Coneixer_microscopi.pdf