Πηγές-Μέσα

https://docplayer.gr/445717-Ti-einai-omos-diatrofi-oi-anthropoi-opos-oloi-oi-zontanoi-organismoi-ehoyn-anagki-apo-trofi-kai-nero-gia-na-megalosoyn-sosta.html

http://ebooks.edu.gr/ebooks/v/html/8547/2328/Oikiaki-Oikonomia_A-Gymnasiou_html-apli/index3_1.html

aesop.iep.edu.gr/node/21213/5324

http://photodentro.edu.gr/v/item/video/8522/541

http://photodentro.edu.gr/aggregator/lo/photodentro-ugc-8525-860

photodentro.edu.gr/v/item/ds/8521/3564

http://ebooks.edu.gr/ebooks/v/html/8547/2328/Oikiaki-Oikonomia_A-Gymnasiou_html-apli/index3_1.html

http://photodentro.edu.gr/v/item/ds/8521/3550