Billing details

United Kingdom (UK)

Your order

Product Subtotal
Critique a Study using Concepts of Reliability, Internal, and External Validity  × 1 $7.50
Subtotal $7.50
Total $7.50
  • Pay via PayPal; you can pay with your credit card if you don’t have a PayPal account.

Your personal data will be used to process your order, support your experience throughout this website, and for other purposes described in our privacy policy.