توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Shahaby Ahmad F., El-din Khaled M. Essam, & Excellent Publishers. Desulfurization of Crude Oil and Oil Products by Local Isolated Bacterial Strains.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Shahaby Ahmad F., El-din Khaled M. Essam, و Excellent Publishers. Desulfurization of Crude Oil and Oil Products by Local Isolated Bacterial Strains.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

Shahaby Ahmad F., et al. Desulfurization of Crude Oil and Oil Products by Local Isolated Bacterial Strains.