you are likely to find Monkey in/at/on Works. you are likely to find Monkey in/at/on Laboratory. you are likely to find Laboratory in/at/on University. you are likely to find Mathematics in/at/on University. 
Source is a type of Obtain. Obtain is related to Keep. Jar can be used for Keep. you are likely to find Fruit in/at/on Jar. 
Works <--AtLocation-- Monkey --AtLocation--> Laboratory --AtLocation--> University <--AtLocation-- Mathematics 
Source --IsA--> Obtain <--RelatedTo--> Keep <--UsedFor-- Jar <--AtLocation-- Fruit 