Once you have purchased the Ross Rifle books from Service Publications, you can also look for these publications on the weapon.
Canadian Army training Manual No. 1 - A General Instructional Background for the Young Soldier - 1942. This manual gives directions on how the rifle functions and how to strip it for cleaning.
If you have a bit of spare cash there is also this book:
The Ross Rifle Story, ISBN 978-09 6919 0608, published in 1984.