Helm Information Ltd · University of Oklahoma Press
| title | ISBN-13 | year of publication |
|---|---|---|
| Companion to Edwin Drood, The | 978-1-903206-28-7 | 1986 |
| Companion to Our Mutual Friend, The | 978-1-903206-27-0 | 1986 |
| Tennyson's Maud: A Definitive Edition | 978-0-8061-1986-1 | 1986 |
| The companion to Bleak House | 978-1-903206-29-4 | 1988 |