Cornell University Library · Nabu Press
| title | ISBN-13 | year of publication |
|---|---|---|
| Evolution | 978-1-146-74403-4 | 2010 |
| Evolution in Science, Philosophy, and Art: Popular Lectures and Discussions Before the Brooklyn Ethical Association | 978-1-112-52842-2 | 2009 |
| Life and the Conditions of Survival: The Physical Basis of Ethics, Sociology and Religion | 978-1-143-73484-7 | 2010 |
| Sociology, Popular Lectures and Discussions Before the Brooklyn Ethical Association | 978-1-112-20171-4 | 2009 |