1.   First, throughout history these major institutions were the primary sources of human values.

2.   For many people, the primary source of anxiety is work.

3.   For most people, in short, a job is a primary source of meaning and order in their lives.

4.   For these reasons it is often difficult in many cases to trace a single primary source.

5.   If we define them simply, primary sources are those written at the time by some one usually connected with the event.

6.   It has relied on groundnut oil as its primary source of export revenue for Decades.

7.   Many of the villagers rely on fishing as their primary source of income.

8.   Moreover, they saw their primary source of leverage-financial rewards-as less effective with the big producer.

9.   Official documents account for a large proportion of the primary sources.

10.   Once the line between the conventional primary source and the secondary study is crossed, the flood is even worse.