APA aipamena

Walach, H. (2015). Secular Spirituality: The Next Step Towards Enlightenment. Springer.

Chicago Style aipamena

Walach, Harald. Secular Spirituality: The Next Step Towards Enlightenment. Springer, 2015.

MLA aipamena

Walach, Harald. Secular Spirituality: The Next Step Towards Enlightenment. Springer, 2015.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.