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وزارة الزراعة واستصلاح الأراضی. مرکز البحوث الزراعیة . الإدارة المرکزیة للإرشاد الزراعی (2005) "خدمة وزراعة حبة البرکة" . معهد بحوث البساتین – قسم بحوث النباتات الطبیة والعطریة- نشرة رقم 984.