Ahmad Ghazali, A. H. (2001). Nitrogen Fixation and Plant Growth Enhancement by Beneficial Rhizobacteria in Association with Oil Palm Seedlings.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ahmad Ghazali, Amir Hamzah. Nitrogen Fixation and Plant Growth Enhancement by Beneficial Rhizobacteria in Association with Oil Palm Seedlings. 2001.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ahmad Ghazali, Amir Hamzah. Nitrogen Fixation and Plant Growth Enhancement by Beneficial Rhizobacteria in Association with Oil Palm Seedlings. 2001.
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