Menachot 37b:5מנחות ל״ז ב:ה׳
With regard to the statement of the baraita that the phylacteries of the head are donned on the upper part of the head, the Gemara asks: From where do we derive this? As the Sages taught: “Between your eyes” (Exodus 13:9); this is the upper part of the head. Do you say that this is the upper part of the head, or is it only literally between your eyes? It is stated here: “Between your eyes,” and it is stated there: “You shall not cut yourselves, nor make any baldness between your eyes for the dead” (Deuteronomy 14:1), Just as there, the phrase “between your eyes” is referring to a place on the upper part of the head, as that is a place where one can render himself bald by removing his hair, so too, the place where phylacteries are donned is on the upper part of the head, a place where one can render himself bald.
Shulchan Arukh, Orach Chayim 27:9שולחן ערוך, אורח חיים כ״ז:ט׳
The correct placement of the shel rosh is from the hairline by the forehead until the end of the soft spot of a baby’s head.
Mishnah Berurah 27:33משנה ברורה כ״ז:ל״ג
...
Arukh HaShulchan, Orach Chaim 27:20ערוך השולחן, אורח חיים כ״ז:כ׳
...
Biur Halacha 27:9:1ביאור הלכה כ״ז:ט׳:א׳
...
Kiddushin 36a:9קידושין ל״ו א:ט׳
Rava said that this is Isi’s reason, as he derives the verbal analogy of “between your eyes” with regard to baldness from phylacteries, concerning which it says: “And they shall be for frontlets between your eyes” (Deuteronomy 11:18): Just as there, with regard to phylacteries, women are exempt, so too here, in the case of baldness, women are exempt. The Gemara asks: And what is the reason that Rava did not state the same reason as Abaye? The Gemara answers: Rava does not learn anything from the distinction between keraḥ and korḥa, as he maintains that no halakha can be derived from this slight difference in language.
Rashi on Kiddushin 36a:10:1רש"י על קידושין ל״ו א:י׳:א׳
...
Tosafot on Kiddushin 36a:10:1תוספות על קידושין ל״ו א:י׳:א׳
...
Chidushei Halachot on Kiddushin 36a:3חדושי הלכות על קידושין ל״ו א:ג׳
...
Penei Yehoshua on Kiddushin 36a:2-3פני יהושע על קידושין ל״ו א:ב׳-ג׳
...