APA
Peale N. V., . (1976). Positive principle today: How to renew and sustain the power of positive thinking. New York: Fawcett.
Chicago
Peale Norman Vincent, . 1976. Positive principle today: How to renew and sustain the power of positive thinking. New York: Fawcett.
Harvard
Peale N. V., . (1976). Positive principle today: How to renew and sustain the power of positive thinking. New York: Fawcett.
MLA
Peale Norman Vincent, . Positive principle today: How to renew and sustain the power of positive thinking. New York: Fawcett. 1976.