Information:  - Weetzie Bat is the debut novel of Francesca Lia Block, published by HarperCollins in 1989. It inaugurated her "Dangerous Angels" series for young adults.  - Francesca Lia Block (born December 3, 1962) is an American writer of adult and young-adult literature: fiction, short stories, screenplays and poetry. She is known best for the Weetzie Bat series  named after its first installment and her first novel, which she wrote while a UC Berkeley student, "Weetzie Bat" (HarperColins, 1989). She is known for her use of imagery, especially in describing the city of Los Angeles. One "New York Times Book Review" critic said, "Block writes about the real Los Angeles better than anyone since Raymond Chandler." She won the Margaret Edwards Award from the American Library Association in 2005 for her contribution in writing for teens.  - The American Library Association (ALA) is a nonprofit organization based in the United States that promotes libraries and library education internationally. It is the oldest and largest library association in the world, with more than 62,000 members.  - Echo fantasy novel by Francesca Lia Block , published in 2000 by Harper Collins . It follows the life of Echo , who , in her teens , meets a boy with angel wings , for whom she still finds herself waiting for years later . Some chapters are , however , almost completely dedicated to lives of her friends , family and boyfriends .    Given the information above, choose from the list below the object entity that exhibits the relation 'publisher' with the subject 'echo '.  Choices: - american library association  - harpercollins
Answer:
harpercollins