The ordinance is subject to referendum as other ordinances and shall designate:
(a) The issue of bonds to be reduced.
(b) The total principal amount of the issue acquired.
(c) The purchase price paid for the bonds.
(d) The principal amount of the proposed reduction.
(e) The numbers, denominations, and maturity dates of the bonds to be canceled.
(f) The time and place of the proposed cancellation.