Horst, R. (2004). March of the unknown (2nd ed.). Prismakolor Commercial.
Chicago-viite (17. p.)Horst, Rudolf. March of the Unknown. 2nd ed. Quezon City: Prismakolor Commercial, 2004.
MLA-viite (9. p.)Horst, Rudolf. March of the Unknown. 2nd ed. Prismakolor Commercial, 2004.
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