APA (7th ed.) Citation

Guilelmus Arvernus. (2011). Selected spiritual writings: Why God became man; On grace; On faith. Pontifical Inst. of Mediaeval Studies.

Chicago Style (17th ed.) Citation

Guilelmus Arvernus. Selected Spiritual Writings: Why God Became Man; On Grace; On Faith. Toronto: Pontifical Inst. of Mediaeval Studies, 2011.

MLA (9th ed.) Citation

Guilelmus Arvernus. Selected Spiritual Writings: Why God Became Man; On Grace; On Faith. Pontifical Inst. of Mediaeval Studies, 2011.

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