Admit is related to Inform. Inform is a synonym of Understand. 
Hallway is a type of Room. Room is related to Library. you are likely to find Reference in/at/on Library. Reference is a synonym of Cite. 
Admit <--RelatedTo--> Inform <--Synonym--> Understand 
Hallway --IsA--> Room <--RelatedTo--> Library <--AtLocation-- Reference <--Synonym--> Cite 