Citing your sources properly shows that you have done your research and consulted appropriate sources for your topic. It also acknowledges that all research builds on work that has come before. You must give credit to sources that have influenced or informed your work. If you do not do this, you are essentially stealing another person's ideas, which is plagiarism.
Whenever you use another person's ideas, even if you put it into your own words (called 'paraphrasing'), you must give them credit. You do this by CITING the source you used in two places:
APA citation for this video:
Memorial University Libraries (2013). Referencing sources in APA style: A basic introduction [Video file]. Retrieved from https://youtu.be/gGtkh_-9OC0
APA citation for this video:
Memorial University Libraries (2013). APA style reference list: How to reference journal articles [Video file]. Retrieved from https://youtu.be/iJTo2wMEjhg
APA citation for this video:
Memorial University Libraries (2013). APA reference list: How to reference books [Video file]. Retrieved from https://youtu.be/QkFyDiSgSBM
See screenshot from this reference book:
Notice that the suggested APA citation needed a few corrections!
Screenshot from Curio database: