Borghouts, J. F. (2010), Egyptian: an introduction to the writing and language of the Middle Kingdom, 2 vols. Egyptologische Uitgaven 24, page 69, note 4
Gardiner, Alan Henderson (1957), Egyptian grammar being an introduction to the study of hieroglyphs, 3rd, revised edition, page 473
Seyr, Ph. (2023), Graphetic compounding in the First Intermediate Period: the micro-history of [hiero] ḥtr.wy "span" and the process of sign decomposition. Hieroglyphs 1, 149-183, p. 156, n. 32