The Bell Jar is written by Sylvia PlathSylvia Plath wrote The Collected PoemsThe Collected Poems is written by Sylvia Plath
[Human]: Do you have some facts about the book, The Bell Jar, that you could provide to me? [Assistant]: Certainly, it was written by Sylvia Plath and is a fiction book. [Human]: I think I have heard of her and wonder if it was a book of poems that she may have written also? 
Yes, she wrote The Collected Poems which was released in 1981. What else would you like to know about her?