| Titel | ISBN-13 (ISBN-10) | Erscheinungsjahr |
|---|---|---|
| Economic Valuation of Recreational Benefits of Environmental Resources: Economic Valuation of Recreational Benefits of Wonchi Crater Lake, Ethiopia | 978-3-659-80674-2 (3-659-80674-9) | 2015 |
| Households' Willingness to Pay for Improved Water Supply: Assessing Households' Willingness to Pay for Improved Water Supply Services in Shambu Town, Ethiopia | 978-3-659-64288-3 (3-659-64288-6) | 2015 |