6 1 40 W.David Downey Additional Author Steven P. Erickson Additional Author mixed material 0070176671 New York Mc Graw-Hill Book Company 1987 Agribusiness_Management.jpg W.David Downey Additional Author Steven P. Erickson Additional Author alih bahasa Rochidayat Ganda S. Additional Author mixed material Jakarta Erlangga 1992 MANEJEMEN_AGRIBISNIS_EDISI_KEDUA.jpg W. David Downey Additional Author mixed material 070662590 New York Mc Graw-Hill Book Company 1981 Agribusiness_Management.jpg W. David Downey Additional Author Steven P. Erickson Additional Author mixed material Jakarta Erlangga 1992 Manajemen_Agribisnis_edisi_2.jpg W.David Downey Additional Author Steven P.Erikson:Alih bahasa Rochidayat Ganda S Additional Author mixed material Jakarta Erlangga 1992 Mamajemen_Agribisnis_Edisi_2.jpg W. David Downey Additional Author Steven P. Erickson Additional Author mixed material Jakarta Erlangga 1992