APA
Pierrefeu E. T. d., . (1955). Unity in the spirit. Ringe: Richard R. Sith Publisher.
Chicago
Pierrefeu Elsa Tudor de, . 1955. Unity in the spirit. Ringe: Richard R. Sith Publisher.
Harvard
Pierrefeu E. T. d., . (1955). Unity in the spirit. Ringe: Richard R. Sith Publisher.
MLA
Pierrefeu Elsa Tudor de, . Unity in the spirit. Ringe: Richard R. Sith Publisher. 1955.
