Keel, J. A. (1971). Operation Trojan horse: An exhaustive study of unidentified flying objects - revealing their source and the forces that control them. Souvenir Press.
Lua i Stíl Chicago (17ú heag.)Keel, John A. Operation Trojan Horse: An Exhaustive Study of Unidentified Flying Objects - Revealing Their Source and the Forces That Control Them. London: Souvenir Press, 1971.
Lua MLA (8ú heag.)Keel, John A. Operation Trojan Horse: An Exhaustive Study of Unidentified Flying Objects - Revealing Their Source and the Forces That Control Them. Souvenir Press, 1971.
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