Any bonds issued by the authority may from time to time be refunded by the issuance, by sale or exchange, of refunding bonds payable from the same or different sources for the purpose of paying all or any part of the principal of the bonds to be refunded, any redemption premium required to be paid as a condition to the redemption prior to maturity of any such bonds that are to be so redeemed in connection with such refunding, any accrued and unpaid interest on the bonds to be refunded, any interest to accrue on each bond to be refunded to the date on which it is to be paid, whether at maturity or by redemption prior to maturity, and the expenses incurred in connection with such refunding; provided, that unless duly called for redemption pursuant to provisions contained therein, the holders of any such bonds then outstanding and proposed to be refunded shall not be compelled without their consent to surrender their outstanding bonds for such refunding. Any refunding bonds may be sold by the authority at public or private sale at such price or prices as may be determined by its board to be most advantageous, or may be exchanged for the bonds or other obligations to be refunded. Any refunding bonds issued by the authority shall be issued and may be secured in accordance with the provisions of Section 2-3A-8.