Doppler Shift %28doppler Effect%29
Here's your citation in American Psychological Association (APA) format:
Doppler Shift %28doppler Effect%29. (n.d.). In Alleydog.com's online glossary. Retrieved from: https://www.alleydog.com/glossary/definition-cit.php?term=Doppler+Shift+%2528doppler+Effect%2529