Griggs, G. B. (1977). The earth and land use planning. Duxbury.
Cita Chicago Style (17a ed.)Griggs, Gary B. The Earth and Land Use Planning. North Scituate: Duxbury, 1977.
Cita MLA (9a ed.)Griggs, Gary B. The Earth and Land Use Planning. Duxbury, 1977.
Precaución: Estas citas no son 100% exactas.