Citazione Stile APA (7a Edizione)

Armstrong, D. G., & Hunkins, F. P. (1989). World geography: People and places. Merrill.

Citazione stile Chigago Style (17a edizione)

Armstrong, David G., e Francis P. Hunkins. World Geography: People and Places. Columbus, Ohio [u.a.]: Merrill, 1989.

Citatione MLA (9a ed.)

Armstrong, David G., e Francis P. Hunkins. World Geography: People and Places. Merrill, 1989.