Citation problems- opposing viewpoints book.?

I'm writing a paper on eating disorders and a major source i am using is a book called eating disorders opposing viewpoints (part of the opposing viewpoints series). Inside there are different articles. when citing should i use the book as a whole or the name of the article i'm using. the reason i'm confused is because of the pages. one of the page i want to cite is 79 of the book, but i dont know what page it would be from the actual article. im also writing in mla format. i hope this makes sense lol.