Relation is related to Affair. Affair is related to Hotel. 
you are likely to find Reference in/at/on Library. you are likely to find Journal in/at/on Library. Diary is a type of Journal. Diary is similar to Log. 
Relation <--RelatedTo--> Affair <--RelatedTo--> Hotel 
Reference --AtLocation--> Library <--AtLocation-- Journal <--IsA-- Diary <--SimilarTo--> Log 