![Leonard, it is a source of great pain
to me and my family...
Leonard, it is a source of great pain
to me and my family...](https://content2.mcqstudy.com/ss/tbbt-4-18-00:07:15.013.jpeg)
Leonard, it is a SOURCE of great pain
to me and my family...
The Big Bang Theory Season 4, Episode 18
![as a source of information
as a source of information](https://content2.mcqstudy.com/ss/tbbt-11-16-00:07:23.501.jpeg)
as a SOURCE of information
The Big Bang Theory Season 11, Episode 16
![she might not have been
a reliable source of information?
she might not have been
a reliable source of information?](https://content2.mcqstudy.com/ss/got-77-00:37:32.456.jpeg)
she might not have been
a reliable SOURCE of information?
Game of Thrones Season 7, Episode 7
![I know that money can
be a source of friction
I know that money can
be a source of friction](https://content2.mcqstudy.com/ss/tbbt-12-3-00:17:26.828.jpeg)
I know that money can
be a SOURCE of friction
The Big Bang Theory Season 12, Episode 3
![But not so deep as to introduce
a new source of friction. But not so deep as to introduce
a new source of friction.](https://content2.mcqstudy.com/ss/tbbt-2-5-00:13:12.540.jpeg)
But not so deep as to introduce
a new SOURCE of friction."
The Big Bang Theory Season 2, Episode 5