I'm surprised you know that REFERENCE.
The Big Bang Theory Season 8, Episode 19
In REFERENCE to a database
much larger than anything
I know of in the park.
Westworld Season 2, Episode 4
I challenge you to find a single REFERENCE
to Kryptonian skin cells.
The Big Bang Theory Season 1, Episode 2
The Star Trek REFERENCE
and the play on words...
The Big Bang Theory Season 2, Episode 22
was an obvious REFERENCE
The Big Bang Theory Season 7, Episode 3