APA (7th ed.) Citation

Rhau, G., & Gerber, R. Sacrorum Hymnorum Liber Primus.

Chicago Style (17th ed.) Citation

Rhau, Georg, and Rudolf Gerber. Sacrorum Hymnorum Liber Primus.

MLA (9th ed.) Citation

Rhau, Georg, and Rudolf Gerber. Sacrorum Hymnorum Liber Primus.

Warning: These citations may not always be 100% accurate.