Gaya APA
Troeh, Frederick R.. (1999).
Soil and water conservation : productivity and environmental protection .
New Jersey:
Prentice Hall.
Gaya Chicago
Troeh, Frederick R..
Soil and water conservation : productivity and environmental protection.
New Jersey:
Prentice Hall,
1999.
Tesis.
Gaya MLA
Troeh, Frederick R..
Soil and water conservation : productivity and environmental protection.
New Jersey:
Prentice Hall,
1999.
Tesis.
Gaya Turabian
Troeh, Frederick R..
Soil and water conservation : productivity and environmental protection.
New Jersey:
Prentice Hall,
1999.
Tesis.