Harpo speaks-- about New York; by Harpo Marx with Rowland Barber ; with an introduction by E.L. Doctorow by Rowland Harpo ; Barber - First printing (stated) - 2001 - from Calvello Books (SKU: 92825)
Harpo Marx on I've Got a Secret 5/3/61 - YouTube
Son of Harpo Speaks!, by Bill Marx – Philo on Books
Speaking of Harpo : Fleming Marx, Susan, Bader, Robert S.: Amazon.fr: Livres