Actually, everything above is correct as examples of income except for one item: "cash received from debtors."
This item is not actual income but rather just a cash receipt (not the same thing). It is just money being paid by people that owe you (called "debtors").
The income relating to these debts would have been recorded separately - usually in the form of sales or services rendered.
See the lesson on accrued income for a full explanation of the difference between income itself and the cash received as a result of making some income.
Best, Michael Celender Founder of Accounting Basics for Students