Reference for Ketubot 3:8
כָּל מָקוֹם שֶׁיֵּשׁ מֶכֶר, אֵין קְנָס. וְכָל מָקוֹם שֶׁיֵּשׁ קְנָס, אֵין מֶכֶר. קְטַנָּה יֶשׁ לָהּ מֶכֶר וְאֵין לָהּ קְנָס. נַעֲרָה יֶשׁ לָהּ קְנָס וְאֵין לָהּ מֶכֶר. הַבּוֹגֶרֶת אֵין לָהּ לֹא מֶכֶר וְלֹא קְנָס:
Wherever there is selling [i.e., selling rights of a father in his daughter (that is, when she is a minor)], there is no knass [i.e., he has no knass rights in her, there being no knass for a minor. The halachah is not in accordance with this Mishnah; for this Mishnah is in accordance with R. Meir, who says that there is no knass for a minor. But the sages say that there is knass for a minor, and the halachah is in accordance with the sages. A minor (k'tanah) in this connection is a girl from three years until twelve years and one day, when she shows two (pubertal) hairs.]; and wherever there is knass, [from the time she is a na'arah; that is, when she is twelve years and one day old and shows two hairs, at which time she receives knass], there is no selling, [a man not selling his daughter when she is a na'arah]. With a minor, there is selling, and there is no knass; with a na'arah, there is knass, and there is no selling. With a bogereth, there is neither selling nor knass. [From the age of twelve years, six months and one day and showing two hairs, she is called a "bogereth." Her father cannot sell her and she receives no knass.]