APA aipamena

Croner, U. H. E. (1964). Trade directories of the world.

Chicago Style aipamena

Croner, Ulrich H. E. Trade Directories of the World. 1964.

MLA aipamena

Croner, Ulrich H. E. Trade Directories of the World. 1964.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.