Cita APA (7a ed.)

Trilling, B., & Fadel, C. (2009). 21st century skills: Learning for life in our times. Jossey-Bass.

Cita Chicago Style (17a ed.)

Trilling, Bernie, y Charles Fadel. 21st Century Skills: Learning for Life in Our Times. San Francisco: Jossey-Bass, 2009.

Cita MLA (9a ed.)

Trilling, Bernie, y Charles Fadel. 21st Century Skills: Learning for Life in Our Times. Jossey-Bass, 2009.