How to extract a value with a condition from ref table

[Nadhirah]

I have done an application to generate a report. There should be select month and select document button. 
These buttons is from referenced table. I would like to only able the select month value for the status closed. I tried (Work Order[status] = “Closed”, Work Order[Month]) but unfortunately it returns error and say list cannot be compared with text. 

Work Order = tablename

Does anyone have any other suggestion for me to fix this issue ?