Zalpuwa - the Hittite city is sometimes associated with İkiztepe.
Ikiztepe site consists of two large, two small mounds. Tepe I was occupied from chalcolithic and bronze age periods.
- Mariya Ivanova, The Black Sea and the Early Civilizations of Europe, the Near East and Asia, Cambridge University Press 2013, pp. 231 ff.
- Steadman, Sharon R.; McMahon, Gregory The Oxford Handbook of Ancient Anatolia: (10,000-323 BCE), 2011, p. 160
- https://tr.wikipedia.org/wiki/%C4%B0kiztepe_H%C3%B6y%C3%BC%C4%9F%C3%BC [turkish]