Cita APA (7th ed.)

Maathai, W. (2006). Green belt movement. Harvard Business School Press.

Cita Chicago (17th ed.)

Maathai, Wangari. Green Belt Movement. Boston: Harvard Business School Press, 2006.

Cita MLA (9th ed.)

Maathai, Wangari. Green Belt Movement. Harvard Business School Press, 2006.