
The Star Trek REFERENCE
and the play on words...
The Big Bang Theory Season 2, Episode 22

If you ever need a REFERENCE
or anything, just let me know.
The Big Bang Theory Season 9, Episode 23

That is a cleverly veiled REFERENCE
to Howard's lifelong obsession...
The Big Bang Theory Season 6, Episode 9

In REFERENCE to a database
much larger than anything
I know of in the park.
Westworld Season 2, Episode 4

What REFERENCE?
The Big Bang Theory Season 8, Episode 19