Gaya APA
Graff, Jan de. (1993).
Soil Conservation and Sustainable Land Use: An Economic Approach .
Amsterdam:
Royal Tropical Institute.
Gaya Chicago
Graff, Jan de.
Soil Conservation and Sustainable Land Use: An Economic Approach.
Amsterdam:
Royal Tropical Institute,
1993.
Text.
Gaya MLA
Graff, Jan de.
Soil Conservation and Sustainable Land Use: An Economic Approach.
Amsterdam:
Royal Tropical Institute,
1993.
Text.
Gaya Turabian
Graff, Jan de.
Soil Conservation and Sustainable Land Use: An Economic Approach.
Amsterdam:
Royal Tropical Institute,
1993.
Print.