"Tzitzit". The Karaite Korner. Retrieved 17 December 2015.
kehuna.org
Yevamot 4a, Nazir 41b, Leviticus Rabbah 22:10. See also Menahot 39b-40a where this is recorded as the position of Beit Hillel but not Beit Shammai. Rabbinic sources rule this practice as permissible, while kabbalist sources go a step further by encouraging the practice ("Tzitzit made of kilayim?". Kehuna.org. 2016-05-11. Retrieved 2018-04-18.)
Rabbi Shoshana Gelfand (2002). Rabbi Kassel Abelson; Rabbi David J. Fine (eds.). May Women Tie Tzitzit Knots?(PDF). The Committee on Jewish Law and Standards of the Conservative Movement. ISBN9780916219192. {{cite book}}: |work= ignored (help)