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APA-referensKeel, J. A. (1971). Operation Trojan horse: An exhaustive study of unidentified flying objects – revealing their source and the forces that control them. Souvenir Press Ltd.
Chicago-stil citatKeel, John A. Operation Trojan Horse: An Exhaustive Study of Unidentified Flying Objects – Revealing Their Source and the Forces That Control Them. London: Souvenir Press Ltd, 1971.
MLA-referensKeel, John A. Operation Trojan Horse: An Exhaustive Study of Unidentified Flying Objects – Revealing Their Source and the Forces That Control Them. Souvenir Press Ltd, 1971.
Harvard-stil citatKeel, J. A. 1971. Operation Trojan horse: An exhaustive study of unidentified flying objects – revealing their source and the forces that control them. London: Souvenir Press Ltd.