Citazione Stile APA (7a Edizione)

Willis, G. (2018). Permaculture: Principles and practice (1a. ed.). Larsen and Keller Education.

Citazione stile Chigago Style (17a edizione)

Willis, George. Permaculture: Principles and Practice. 1a. ed. Nueva York: Larsen and Keller Education, 2018.

Citatione MLA (9a ed.)

Willis, George. Permaculture: Principles and Practice. 1a. ed. Larsen and Keller Education, 2018.