A plural noun is a word that indicates that there is more than one person, animal place, thing, or idea. When you talk about more than one of anything, you're using plural nouns. When you write about more than one of anything, you usually use the same word, simply adding an s, es, or ies to the end.
Columbus and the writers of the Mayflower Compact
The most credible source for researching the life of President Bill Clinton is Bill Clinton himself.
It's his life and it's his story to tell. Since he is still alive it is better to conduct an interview with him about his life story. You can also do interviews with the people in his life since childhood to corroborate with his stories.
