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Objective-C - Wikipedia
Objective-C Tutorial - Online Tutorials Library
What Is Objective C? (Definition, Uses, vs. Swift)
About Objective-C - Apple Developer
What Is Objective C? (Definition, Uses, vs. Swift) | Built In
Foundations of Objective-C App Development - Coursera
Computer Programming Languages: Objective-C
Objective-C Hello World Tutorial | DigitalOcean
A Beginner's Guide to Objective-C: Getting Started with iOS …
Mastering Objective-C: A Comprehensive Guide for iOS Developers