Van Der Berg, H. H. (1981). Horticultural research international: Directory of horticultuRal research institutes and their ac tivities in 61 countries. International Society for Agricultural Sciences.
استشهاد بنمط شيكاغوVan Der Berg, H H. Horticultural Research International: Directory of HorticultuRal Research Institutes and Their Ac Tivities in 61 Countries. Netherlands: International Society for Agricultural Sciences, 1981.
MLA استشهادVan Der Berg, H H. Horticultural Research International: Directory of HorticultuRal Research Institutes and Their Ac Tivities in 61 Countries. International Society for Agricultural Sciences, 1981.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.