An ordinance or rule adopted in accordance with the procedures provided for in this chapter may be amended or repealed in accordance with the procedure herein set forth relating to adoption of ordinances and rules, and the provisions of this chapter, including the right of petition and referendum contained in section 1973 of this title, shall apply to the amendment or repeal of an ordinance or rule adopted under this chapter as well as to its enactment. (Added 1969, No. 170 (Adj. Sess.), § 8, eff. March 2, 1970.)