Copyright permission for use of images in book

Hello there,

I am about to begin a book on unmanned vehicles and wanted to include a few types from ardupilot forum for reference and need some images. Reference to the link will of course be provided.
I saw that Ardupilot has mentioned the content as CC-by-SA. However, I would like to get clarification or permission to use images in my book. (country of origin of the book will be India).

Please help. Thank you so much.

This is the license: