If you're not updating ROAS and CPA targets frequently, you're missing out
Amazon AdWords: How to Run Google Ads for Amazon Products
Who Should Use Target CPA Automated Bidding For AdWords Campaign? - Karooya
How to Optimize Adwords Campaigns and Pay for Conversions Only
CPA – intomarkets
Amazon AdWords: How to Run Google Ads for Amazon Products
Amazon Ads vs. Google Ads: Where to Advertise [Infographic]
Amazon.com: From Zero to Super Affiliate: Learn Affiliate Marketing With Paids Ads Starting From Scratch: Work From Home, Affiliate Marketing, Facebook Ads, Google Adwords,PPC,CPA Offers Marketing eBook : O'dree, Attila: Kindle Store
Creating Target CPA Experiment in AdWords - Karooya
A test of Cost Per Action (CPA) vs Cost Per Click (CPC) in Google Adwords | Successful Software
100 Best AdWords Books of All Time - BookAuthority