J Ris. (1973). The establishment of fertilizer recommendations on the basis of soil tests. The Netherland: Instituut Voor Bodemvruchtbaarheid.
Chicago Stili AlıntıJ Ris. The Establishment of Fertilizer Recommendations On the Basis of Soil Tests. The Netherland: Instituut Voor Bodemvruchtbaarheid, 1973.
MLA AlıntıJ Ris. The Establishment of Fertilizer Recommendations On the Basis of Soil Tests. The Netherland: Instituut Voor Bodemvruchtbaarheid, 1973.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..