APA
Schweitzer A., . (1961). Pilgrimage to Humanity. New York: Philosophical Library.
Chicago
Schweitzer Albert, . 1961. Pilgrimage to Humanity. New York: Philosophical Library.
Harvard
Schweitzer A., . (1961). Pilgrimage to Humanity. New York: Philosophical Library.
MLA
Schweitzer Albert, . Pilgrimage to Humanity. New York: Philosophical Library. 1961.
