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Books about Kupanta:
Part 1. A Hittite manual for beginners: Part 2, The "Treaty" of Mursilis with Kupanta-Kal, (Hittite studies, ed... by George A Barton (1928)
Wiki information Kupanta:
Kupanta-Kurunta was the first recorded king of Arzawa, in the late 15th century BC. He was defeated by Tudhaliya I and Arnuwanda I. He then attacked Arnuwanda's restive vassal Madduwatta at Zippasla. He had a daughter, who married Madduwatta. Another...