You're most welcome to order one of the books of my late mother "Da'wah According To The Qur'an And Sunnah" (Allah yarhamha. Ameen.) at Darussalam Publishers:
https://darussalam.com/dawah-according-to-the-quran-and-the-sunnah/
https://darussalamstore.com/en/
https://darussalam.com/the-quran-the-divine-revelation/
https://darussalam.com/the-rationale-benefits-of-salat-islamic-prayers/
Or you can read the summary at:
https://www.slideshare.net/mobile/JustSharingIslam/dawah-according-to-the-quran-and-the-prophets-sunnahtradition-by-dr-norlain-khadija-dindang-mababaya
Summary in pdf format:
https://www.scribd.com/document/463363415/Dawah-According-to-the-Quran-and-Sunnah-Mababaya-Dr-Norlain-Dindang-PDFDrive-com-1
https://m.facebook.com/darussalamph/photos/a.1123348177709145/1398834010160559/?type=3&source=48
