Cornell University Library · Nabu Press
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Evolution and Effort: And Their Relation to Religion and Politics | 978-1-142-83977-2 (1-142-83977-X) | 2010 |
| Evolution and Effort: And Their Relation to Religion and Politics | 978-1-112-50976-6 (1-112-50976-3) | 2009 |
| Twentieth Century Socialism: What it is Not; What it is; How it May Come | 978-1-112-34934-8 (1-112-34934-0) | 2009 |