Penn, G. (1955). "Up funnel, down screw!": The story of the Naval Engineer. Hollis & Carter.
Citace podle Chicago (17th ed.)Penn, Geoffrey. "Up Funnel, Down Screw!": The Story of the Naval Engineer. London: Hollis & Carter, 1955.
Citace podle MLA (8th ed.)Penn, Geoffrey. "Up Funnel, Down Screw!": The Story of the Naval Engineer. Hollis & Carter, 1955.
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