Washington 1997, Notes to chapter 6 Washington, Lawrence (1997), Introduction to Cyclotomic Fields, Graduate Texts in Mathematics, vol. 83 (2 ed.), Berlin, New York: Springer-Verlag, ISBN978-0-387-94762-4, MR1421575
Washington 1997, Lemma 6.9 and the comments following it Washington, Lawrence (1997), Introduction to Cyclotomic Fields, Graduate Texts in Mathematics, vol. 83 (2 ed.), Berlin, New York: Springer-Verlag, ISBN978-0-387-94762-4, MR1421575
Washington 1997, ยง6.2 Washington, Lawrence (1997), Introduction to Cyclotomic Fields, Graduate Texts in Mathematics, vol. 83 (2 ed.), Berlin, New York: Springer-Verlag, ISBN978-0-387-94762-4, MR1421575
Washington 1997, Theorem 6.10 Washington, Lawrence (1997), Introduction to Cyclotomic Fields, Graduate Texts in Mathematics, vol. 83 (2 ed.), Berlin, New York: Springer-Verlag, ISBN978-0-387-94762-4, MR1421575