- GeographyHarm J. de Blij, Peter O. Muller
- The world todayHarm J. de Blij, Peter O. Muller
- Physical GeographyH. J. de Blij, Peter O. Muller et al.
- Concepts and regions in geographyHarm J. de Blij, Peter O. Muller et al.
- Physical geography of the global environmentHarm J. de Blij, Harm J. de Blij et al.
- Study guide, de Blij and Muller's 'Geography : realms, regions and concepts'Peter O. Muller, Harm J. de Blij