توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

BELL, R. H. (2021). Theology of Wagner's Ring cycle I: The genesis and development of the tetralogy and the appropriation of sources, artists, philosophers, and theologians. JAMES CLARKE & CO LTD.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

BELL, RICHARD H. Theology of Wagner's Ring Cycle I: The Genesis and Development of the Tetralogy and the Appropriation of Sources, Artists, Philosophers, and Theologians. [S.l.]: JAMES CLARKE & CO LTD, 2021.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

BELL, RICHARD H. Theology of Wagner's Ring Cycle I: The Genesis and Development of the Tetralogy and the Appropriation of Sources, Artists, Philosophers, and Theologians. JAMES CLARKE & CO LTD, 2021.