H. Popper · Herbert Pfeifer · Herbert Pfeiffer · Herbert Pieper
| title | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|
| Modern Cost-engineering Techniques | 978-0-07-050530-8 (0-07-050530-6) | 1970 |
| Modern Technical Management Techniques | 978-0-07-050529-2 (0-07-050529-2) | 1971 |