Halachah · Modern
A Lifetime Companion to the Laws of Jewish Family Life, Appendix H; Issues Involved in a Married Woman Covering her Hair/מדריך להלכות טהרת המשפחה· נספח ח
א
1While not actually part of the laws of niddah, the issue of hair covering is one that is unique to marriage. Therefore a summary of the relevant aspects is provided here.
בוּפָרַע אֶת רֹאשׁ הָאִשָּׁה... לִימֵד עַל בְּנוֹת יִשְׂרָאֵל שֶׁהֵן מְכַסּוֹת רָאשֵׁהֶן. (ספרי במדבר, פיסקא יא)