Παραπομπή APA

Leadbeater Charles W. (2007). Invisible helpers. Thesophical Publishing house.

Παραπομπή Chicago Style

Leadbeater Charles W. Invisible Helpers. Madras: Thesophical Publishing house, 2007.

Παραπομπή MLA

Leadbeater Charles W. Invisible Helpers. Thesophical Publishing house, 2007.