(1985). Cathedral of St. Helena, Helena, Montana. Foundation of St. Helena Cathedral Parish.
Chicago Style aipamenaCathedral of St. Helena, Helena, Montana. [S.l.: Foundation of St. Helena Cathedral Parish, 1985.
MLA aipamenaCathedral of St. Helena, Helena, Montana. Foundation of St. Helena Cathedral Parish, 1985.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.