توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Valchev, D., Ribarova, I., Borisov, B., Radovanov, V., Lyubomirova, V., Kostova, I., . . . Lazarova, S. (2024). Valuable elements in sludge from eight municipal wastewater treatment plants in relation to their recovery potential. SpringerOpen.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Valchev, Dobril, Irina Ribarova, Boyan Borisov, Viden Radovanov, Valentina Lyubomirova, Irina Kostova, Galina Dimova, Orhideya Karpuzova, و Svetlana Lazarova. Valuable Elements in Sludge from Eight Municipal Wastewater Treatment Plants in Relation to Their Recovery Potential. SpringerOpen, 2024.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

Valchev, Dobril, et al. Valuable Elements in Sludge from Eight Municipal Wastewater Treatment Plants in Relation to Their Recovery Potential. SpringerOpen, 2024.