Keefer, R. F. (2000). Handbook of soils for landscape architects. Oxford University.
Chicago Style aipamenaKeefer, Robert F. Handbook of Soils for Landscape Architects. New York: Oxford University, 2000.
MLA aipamenaKeefer, Robert F. Handbook of Soils for Landscape Architects. Oxford University, 2000.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.