https://www.amazon.com/Watchmaking-George-Daniels/dp/0856677043/ref=sr_1_1?dchild=1&keywords=watchmaking&qid=1584367912&sr=8-1&swrs=ECCF03ED52389F94732A2C48C48EF3E9
https://www.amazon.com/Theory-Horology-Charles-Andre-Reymondin/dp/B000BD6ARI/ref=sr_1_1?crid=372M0RJVREFZ6&dchild=1&keywords=the+theory+of+horology&qid=1584367906&sprefix=theory+of+how%2Caps%2C141&sr=8-1
https://www.amazon.com/Clock-Watch-Makers-Guide-Making/dp/B002HZTXC2/ref=sr_1_1?dchild=1&keywords=gear+cutting+for+watchmakers&qid=1584367921&sr=8-1&swrs=ECCF03ED52389F94732A2C48C48EF3E9