Creative Commons licenses require that credit be given to creator of a work [1]. This is stated as:

Attribution — You must give appropriate credit , provide a link to the license, and indicate if changes were made . You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. [2]

“Appropriate credit” is defined as:

appropriate credit — If supplied, you must provide the name of the creator and attribution parties, a copyright notice, a license notice, a disclaimer notice, and a link to the material. CC licenses prior to Version 4.0 also require you to provide the title of the material if supplied, and may have other slight differences. [2]

This seems to be stating that if you, say, quote content from a CC licensed work, when you cite it, say, with MLA or APA, you’ll have to also include a copyright notice, a license notice, and a disclaimer notice. This seems like way too much for a simple citation. MLA claims that you don’t need to include the license [3], so I’m not entirely sure what is legally expected.