Citing the work of others is always an important practice, regardless of whether you are using a Creative Commons licensed material or a material that uses standard copyright permissions.
Authors who use Creative Commons licenses are signaling to users their intent for how the work will be used in the future. When citing these materials, it is a good practice to also acknowledge the intent of the creator for their work to be shared and reused within our citations.
Luckily, there is an easy method for citing Creative Commons licenses called the TASL method.