Citazione Stile APA (7a Edizione)
(1935). The national geographical magazine: Index (January-June,1935) (ed.). National geographical society.
Citazione stile Chigago Style (17a edizione)
The National Geographical Magazine: Index (January-June,1935). ed. Washington: National geographical society, 1935.
Citatione MLA (9a ed.)
The National Geographical Magazine: Index (January-June,1935). ed. National geographical society, 1935.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.