Dyfyniad APA
(1935). The national geographical magazine: Index (January-June,1935) (ed.). National geographical society.
Dyfyniad Arddull Chicago
The National Geographical Magazine: Index (January-June,1935). ed. Washington: National geographical society, 1935.
Dyfyniad MLA
The National Geographical Magazine: Index (January-June,1935). ed. National geographical society, 1935.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.