Aggregate as a noun is defined as a whole formed by combining several elements that are typically disparate.
Aggregate as a verb is defined as the act of forming or grouping into a class or cluster.
Congregate is both a verb (gather into a crowd or mass) and an adjective (communal). Segregate is a verb defined as the act of setting apart from the rest or from each other.
If there are no page numbers, paragraph numbers, or obvious subdivisions, cite the author's name in a signal phrase in the text rather than in parentheses at the end of the sentence.
