1. Organising land information for sustainable land administration;Bennett;Land Use Policy,2007
2. Quantity and Quality in Social Research;Bryman,1998
3. Principles of Geographical Information Systems for Land Resources Assessment;Burrough,1986
4. Ontological Tools for Geographic Representation. Formal Ontology in Information Systems;Casati,1998
5. Research Design: Qualitative, Quantitative and Mixed Approaches;Creswell,2003