Gediman, D. This I Believe: Life Lessons. John Wiley & Sons.
Cita Chicago (17th ed.)Gediman, Dan. This I Believe: Life Lessons. John Wiley & Sons.
Cita MLA (8th ed.)Gediman, Dan. This I Believe: Life Lessons. John Wiley & Sons.
Atenció: Aquestes cites poden no estar 100% correctes.