Books 

• NCERT Lab Manual Class 9 Biology
• NCERT Class 9 Biology Textbook 

Websites 

• https://ncert.nic.in/pdf/publication/sciencelaboratorymanuals/classIX/science/ielm103.pdf (Experiment :20, Page no: 7)
• https://ncert.nic.in/textbook/pdf/kebo111.pdf    (Activity No:11.2.2, Page no: 8) 
• https://en.wikipedia.org/wiki/Osmosis