Burkholder, E. F. The 3-D global spatial data model: Principles and applications (Second edition.).
Chicago Edition CitationBurkholder, Earl F. The 3-D Global Spatial Data Model: Principles and Applications. Second edition.
MLA Edition CitationBurkholder, Earl F. The 3-D Global Spatial Data Model: Principles and Applications. Second edition.
Warning: These citations may not always be 100% accurate.