Encyclopædia Iranica, online edition, New York. https://iranicaonline.org/articles/azod-al-dawla-abu-soja, 521; "It should be remembered that "Kurd" in the sources of the 4th-5th/10th-11th centuries refers to all the transhumants of the Zagros region including the Lors (Ebn Meskawayh, Tajāreb II, pp. 383, 392; Ebn al-Aṯīr, VIII, p. 521)."
jstor.org
Asatrian, Garnik. "Prolegomena to the Study of the Kurds." Iran & the Caucasus 13, no. 1 (2009): 1-57. Accessed September 2, 2020. http://www.jstor.org/stable/25597392, 27-28; "It seems, the social aspect of the term Kurd was prevalent even in the times of Sharaf Khan (16th century), who used the ("race of Kurds") to imply ethnic groups of different kinds but with similar lifestyles and social and economic setups." p. 27-28.