Cita APA (7th ed.)
Metcalf, C. W., & Felible, R. Lighten Up: Survival Skills for People under Pressure. Addison-Wesley.
Cita Chicago (17th ed.)
Metcalf, Charles Willard, i Roma Felible. Lighten Up: Survival Skills for People Under Pressure. Reading, EUA: Addison-Wesley.
Cita MLA (9th ed.)
Metcalf, Charles Willard, i Roma Felible. Lighten Up: Survival Skills for People Under Pressure. Addison-Wesley.
Atenció: Aquestes cites poden no estar 100% correctes.