| title | ISBN-13 | year of publication |
|---|---|---|
| African Language Studies: v. 10 | 978-0-901877-02-4 | 1969 |
| A Vocabulary of Icibemba | 978-0-7286-0239-7 | 1995 |
| On Mr. Spencer's Formula of Evolution as an Exhaustive Statement of the Changes of the Universe: Followed by a Resume of the Most Important Criticisms of Spencer's "First Principles." | 978-1-112-15671-7 | 2009 |
| On Mr. Spencer's Unification of Knowledge | 978-1-145-55296-8 | 2010 |
Cornell University Library · Nabu Press · Routledge · School of Oriental & African Studies