| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| ICO Islamic Studies Textbook: Grade 1, Part 1 | 978-9960-9681-3-1 (9960-9681-3-8) | 2007 | Paul Addae · Ashraf Ajam |
| ICO Islamic Studies Textbook: Grade 3, Part 1 | 978-9960-9681-5-5 (9960-9681-5-4) | 2016 | Paul Addae · Ashraf Ajam |
| ICO Islamic Studies Textbook: Grade 6, Part 2 | 978-603-8059-26-5 (603-8059-26-1) | 2009 | Paul Addae · Ashraf Ajam |