Ramat, Anna Giacalone.The Indo-European Languages / Anna Giacalone Ramat, Paolo Ramat. — Routledge, 2015. — P. 172. — «The Palaic peoples were very quickly overwhelmed by the invasions of the Kaskas, a non-IE people from the East, who swept them away and for centuries kept attacking the Hittite kingdom». — ISBN 113492187X.Архивная копия от 19 августа 2020 на Wayback Machine
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Ramat, Anna Giacalone.The Indo-European Languages / Anna Giacalone Ramat, Paolo Ramat. — Routledge, 2015. — P. 172. — «The Palaic peoples were very quickly overwhelmed by the invasions of the Kaskas, a non-IE people from the East, who swept them away and for centuries kept attacking the Hittite kingdom». — ISBN 113492187X.Архивная копия от 19 августа 2020 на Wayback Machine