Style de citation APA (7e éd.)

Siemianowski. (1970). Polish Ocean Lines Gdynia: A map schowing the principal ports served regularly by the Polish Ocean Lines. s.n..

Style de citation Chicago (17e éd.)

Siemianowski. Polish Ocean Lines Gdynia: A Map Schowing the Principal Ports Served Regularly by the Polish Ocean Lines. [S.l.: s.n., 1970.

Style de citation MLA (9e éd.)

Siemianowski. Polish Ocean Lines Gdynia: A Map Schowing the Principal Ports Served Regularly by the Polish Ocean Lines. s.n., 1970.