Home » Downloads » External and internal validity External and internal validity External and internal validity http://web.pdx.edu/~stipakb/download/PA555/ResearchDesign.html Discuss an example each of a threat to external validity and internal validity. Answer must be 200 words minimum and must cite at least once. Answer preview to external and internal validity APA 262 words Get instant access to the full solution from yourhomeworksolutions by clicking the purchase button below $4.00 – Purchase Checkout Added to cart