Russwurm, N. (1937). Rev. Paul Joseph Volk: A pioneer missionary in two continents. St. Bernard Abbey.
Lua i Stíl Chicago (17ú heag.)Russwurm, Norbert. Rev. Paul Joseph Volk: A Pioneer Missionary in Two Continents. St. Bernard, Ala.: St. Bernard Abbey, 1937.
Lua MLA (8ú heag.)Russwurm, Norbert. Rev. Paul Joseph Volk: A Pioneer Missionary in Two Continents. St. Bernard Abbey, 1937.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.