I found out through a... personal contact.

我是通过……私人关系发现的。

Attached is my personal contact information.

随信附上我的个人联络资料。

I don't usually have much personal contact with him.

我平常很少与他有私人上的往来。

It is the best to publish your multi personal contact information.

个人联系方式最好能公开。

Maintenance of a healthy work group requires steady personal contact.

维护一个健康的工作小组需要经常性的人员接触。