Kotlin Books — Muhommad Umar

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1. Kotlin® Notes for Professionals

By Stack Overflow Contributors / Goalkicker — beginner-to-intermediate Kotlin reference. :contentReference[oaicite:0]{index=0}

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2. Elements of Kotlin

By Mark L. Murphy — concise, practical guide under Creative Commons. :contentReference[oaicite:1]{index=1}

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3. Kotlin Language Documentation (2.2.20)

Official documentation PDF from Kotlin team. :contentReference[oaicite:2]{index=2}

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