Step 1: The relationship given is based on word meaning:
"Guidelines : Implement" means that guidelines are something you implement.
Step 2: Similarly, "References : ________" means that references are something you cite.
Step 3: Check the options:
- (A) Sight → related to vision, not correct.
- (B) Site → refers to location, not correct.
- (C) Cite → correct, as references are cited.
- (D) Plagiarise → opposite meaning, not correct.
\[
\therefore \; \text{References : Cite :: Guidelines : Implement}
\]
\[
\boxed{\text{Cite}}
\]