How to get the classroom name for a learning item ?

Summary

How to get the classroom name for a learning item ?

Content

For a particular learning item id in WLF_LI_CLASSES_F I want to get the Primary Classroom name but cant find what to link Primary_Classroon_Id from this table to, to to get this ? Any ideas

I have tried linking it to WLF_LM_CLASSES_TL using class_id but this isn't bringing back the primary classroom name?