iOS Quickstart With Google Analytics For Firebase And Google Tag Manager | Simo Ahava's blog
FirebaseUI on CocoaPods.org
Creating a Backend for Your iOS App Using Firebase — SitePoint
CocoaPods could not find compatible versions for pod "Firebase/Core": In snapshot (Podfile.lock): Firebase/Core (= 6.22.0) · Issue #3471 · invertase/react-native-firebase · GitHub
How To Add Firebase to Your iOS App Quickly ← [Updated 2020]