"Have reference to" is a phrase that is often used to imply a connection between two or more things. However, there are a range of synonyms that can be used to express the same meaning. For instance, "pertain to" is a common synonym for "have reference to," as both indicate a relationship or connection between things. Similarly, "relate to" and "concern" can also convey the same meaning. Other synonyms could include "touch upon," "refer to," or "deal with." Ultimately, all of these synonyms convey the idea of a connection or relevance between things, but can be used in different contexts depending on the writer or speaker's preference.