The Parenting Dimensions Test (PDT) and the Perceived Parental Favoritism scale are specialized instruments that may require institutional access, permissions from the original authors, or may be available through academic databases.

Here are a few suggestions for obtaining these resources:

1. Contacting the Authors or Creators: Look for the original studies where these instruments were developed or used. The PDT was developed by Slater and Power (1987), so you might try reaching out to them or other authors who have used the PDT in their studies. Similarly, for the Perceived Parental Favoritism scale, contact the researchers who originally developed it for permissions.

2. University or Library Access: Since you are conducting academic research, check with your university library. They may have access to databases like PsycTests, which house psychological measures and scales, or they may be able to facilitate permissions or purchases.

3. ResearchGate or Academia.edu: Many researchers share their instruments on platforms like ResearchGate. You can search for the scales there and request access directly from the authors.

4. Ethics and Permissions: Ensure that you have the necessary ethical permissions to use these tools, especially if your study involves adolescents. You might need to provide documentation of your study’s ethical review (IRB approval) to the authors to gain access to these instruments.