How do I reference a test/scale/questionnaire in APA (7th ed.)?
Answer
In text:
Parkinson's UK (n.d.)...
OR
...(Parkinson's UK, n.d.).
In the reference list:
Parkinson’s UK. (n.d.). The Parkinson's Disease Questionnaire (PDQ-39). https://www.parkinsons.org.uk/professionals/resources/parkinsons-disease[1][1]questionnaire-pdq-3