Several years ago, I took a college course that introduced a term for "phrases used when citing a text", but as the course was a few years ago, and I cannot find the lesson slides, I cannot remember the term used. It might be something like "tags".
I am not looking for words like "cite", "give attribution", but an actual noun and name for these types of phrases:
Examples: "According to...", "The author claims...", "The author contends...", "The passage reiterates that...", are all examples of this type of phrase.
Without this language: "The Earth is 40,075 km in circumference."
With this language: "According to White (2017), the Earth is 40,075 km in circumference".
Without this language: "The Earth is not entirely round."
With this language: "White (2017) claims that the Earth is not entirely round".
Sample sentence: "The author used too much of the same _____ when citing his sources, he should have instead used much more variety, to keep the paper more interesting."
What term best refers to this?