The Unitarian Universalist Poets A Contemporary American Survey by Jennifer Bosveld Paperback, 202 Pages, Published 1996 by Pudding House Publications ISBN-13: 978-0-614-10187-4, ISBN: 0-614-10187-5
Harpo Marx as Trickster by Charlene Fix Paperback, 232 Pages, Published 2013 by Mcfarland & Company ISBN-13: 978-0-7864-7147-8, ISBN: 0-7864-7147-6