Warford, M. L. (2011). The Spirit's Tether. Alban Institute.
Chicago Style (17th ed.) ZitazioaWarford, Malcolm L. The Spirit's Tether. Herndon, Virginia: Alban Institute, 2011.
MLA (9th ed.) ZitazioaWarford, Malcolm L. The Spirit's Tether. Alban Institute, 2011.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.