The phrase "as said/stated by" is often used to introduce a quotation or to attribute a statement to a specific source. However, there are several synonyms that can be used in place of this phrase to add variety to your writing. Some examples include "as mentioned by," "as declared by," "according to," "reported by," "as expressed by," and "as affirmed by." These synonyms convey the same meaning as the original phrase but add nuance to your writing and prevent repetition. Experimenting with different synonyms for "as said/stated by" can elevate your writing and make it more engaging for the reader.