Citazione Stile APA (7a Edizione)

Fagan, M., & Andrews, M. (1977). Challenge for change: Geographical approaches to selected world issues. McGraw-Hill.

Citazione stile Chigago Style (17a edizione)

Fagan, Margaret, e Marilyn Andrews. Challenge for Change: Geographical Approaches to Selected World Issues. Toronto [u.a.]: McGraw-Hill, 1977.

Citatione MLA (9a ed.)

Fagan, Margaret, e Marilyn Andrews. Challenge for Change: Geographical Approaches to Selected World Issues. McGraw-Hill, 1977.