Mishna Berura Page 15a: Chapter 442;5 to 442;8 Scrubbing Walls and Pots for Chometz Rabbi AE Glatt
Shmiras Halashon - Shaar HaTevunah 8-5 Rabbi MY Edelman
Kitzur Shulchan Aruch Chapter 138;7 - 138;10 The laws of Hoshana Raba, Shemini Atzeres and Simchas Torah Rabbi D Brett
Chovos Halevavos - Gate 7 Teshuva Chapter 7.1 Rabbi D Brett