APA
Lundgren L., . (1993). Twenty years of soil conservation in eastern Africa. Nairobi: Regional Soil Conservation Unit, Swedish International Development Authority.
Chicago
Lundgren Lill, . 1993. Twenty years of soil conservation in eastern Africa. Nairobi: Regional Soil Conservation Unit, Swedish International Development Authority.
Harvard
Lundgren L., . (1993). Twenty years of soil conservation in eastern Africa. Nairobi: Regional Soil Conservation Unit, Swedish International Development Authority.
MLA
Lundgren Lill, . Twenty years of soil conservation in eastern Africa. Nairobi: Regional Soil Conservation Unit, Swedish International Development Authority. 1993.