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| Challenge and response: opportunities for excellence | Ohio University Center for International Studies | Tiada | Ohio | |
| The challenge of man's future | The Viking Press | Tiada | 1954 | |
| The challenge to the south | Oxford University Press | Tiada | 1990 | 0198773110 |
| The challenge of rural poverty | | Tiada | 1980 | 9221022935 |
| The challenge of democracy | McGraw Hill Book Co. | Tiada | 1953 | |
| Developmental challenge in Malaysia | Ohio University Center for International Studies | Tiada | 1968 | |
| Investment challenge in Sabah | | Tiada | 1987 | |
| The Challenge | Pelanduk Publications M. Sdn. Bhd. | Tiada | | 967-978-103-8 |
| The challenge presented to cultures by science and technology | UNESCO | Tiada | 1977 | |