| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Black and White: A Journal of a Three Months' Tour in the United States | 978-1-145-73393-0 (1-145-73393-X) | 2010 |
| On the Action of Examinations Considered As a Means of Selection | 978-1-142-80299-8 (1-142-80299-X) | 2010 |