Schuller, R. H. (1988). Success is never ending, failure is never final. T. Nelson Publishers, Bantam Books.
Citazione stile Chigago Style (17a edizione)Schuller, Robert H. Success Is Never Ending, Failure Is Never Final. Nashville : New York: T. Nelson Publishers, Bantam Books, 1988.
Citatione MLA (8a ed.)Schuller, Robert H. Success Is Never Ending, Failure Is Never Final. T. Nelson Publishers, Bantam Books, 1988.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.