Citazione Stile APA (7a Edizione)

National geographic society, Washington, D. C. (1923). The capital of our country. National geographic society.

Citazione stile Chigago Style (17a edizione)

National geographic society, Washington, D. C. The Capital of Our Country. Washington, D.C: National geographic society, 1923.

Citatione MLA (9a ed.)

National geographic society, Washington, D. C. The Capital of Our Country. National geographic society, 1923.