W.S. · Will Spens · Willy Spannowsky · Willy Spannowsy
| title | media type | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|---|
| Hierarchically Structured Economies: Models with Bilateral Exchange Institutions | Paperback | 978-1-4419-4771-0 (1-4419-4771-X) | 2010 |
| Hierarchically Structured Economies: Models with Bilateral Exchange Institutions | Hardcover | 978-0-7923-4398-1 (0-7923-4398-0) | 1997 |