References:

• Guidelines for Motorcycle helmets by BIS, IS-4151
http://www.team-bhp.com/forum/attachments/ride-safe/1720080d1516698615-only-isi-helmet-says-bangalore-traffic-police-edit-order-withdrawn-helmet-isi.pdf

• Air flow and heat transfer in motorcycle helmet, 2016.
https://www.tandfonline.com/doi/full/10.1080/13588265.2016.1221331?scroll=top&needAccess=true&

• Study of vents design and ventilation in cricket helmet, 2015.
file:///C:/Users/asus/Downloads/a-comparative-study-of-vent-designs-for-effective-ventilation-in-cricket-helmets.pdf

• Design of ventilated helmet, IIT Delhi 2007-2008.
http://www.vref.se/download/18.6a462c7912efb9dc85f80004550/2008+Pinnoji.pdf

Other Links:
• Useful resource e-links related to 'Industrial Design'
• Industrial Design at IDC, IIT Bombay

Case Study Download:
• Motorcycle Helmet Redesign for Ventilation......