Who's WhoˌWho's ˈWho 
trademark a book produced every year in the UK that contains an alphabetical list of famous and important people, such as politicians, writers, and entertainers, and provides information about their achievements, their families etc. If a list of people ‘reads like a Who’s Who’ of something, it means that it contains a lot of famous people: 
The list of guests read like a Who’s Who of the pop industry.
trademark a book produced every year in the UK that contains an alphabetical list of famous and important people, such as politicians, writers, and entertainers, and provides information about their achievements, their families etc. If a list of people ‘reads like a Who’s Who’ of something, it means that it contains a lot of famous people: The list of guests read like a Who’s Who of the pop industry.