| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Introduction to Mathematical Models in Market and Opinion Research: With Practical Applications, Computing Procedures, and Estimates of Computing ... Studies in Economics and Econometrics) | 978-90-277-0096-4 (90-277-0096-6) | 1969 |
| Intro To Mathematical Models I | 978-0-677-61820-3 (0-677-61820-4) | 1969 |
Joseph T. Harder · T.H. · Th. Harder · Theodor: Harder · Thomas Harder · Tilman Harder · Tina Harder