1.   Although not the only source of mystical power, anomalous phenomena are often given special treatment if they are difficult to classify.

2.   Exports, of course, are not the only source of foreign exchange.

3.   Firms producing and selling output are not the only sources of Market or monopoly power.

4.   Hauserman said a First Alert detector sounded in his office, where the only source of carbon monoxide is the nearby interstate.

5.   His only source of superiority is that Frye fagged for him at school.

6.   His pension was his only source of income.

7.   If your only source of income is your basic State pension, you are likely to be entitled to income support.

8.   In any case, the economic sphere is not the only source of surprising responses to various discontents these days.

9.   In this competitive world, the only source of job security is your ability to create value for customers.

10.   Proponents argued that bonds represented the only source of investment funds for many small companies.