Edited by Swallow, R. A. (1989). Clark's positioning in radigraphy (11th ed.). CBS.
Lua i Stíl Chicago (17ú heag.)Edited by Swallow, R. A. Clark's Positioning in Radigraphy. 11th ed. Delhi: CBS, 1989.
Lua MLA (9ú heag.)Edited by Swallow, R. A. Clark's Positioning in Radigraphy. 11th ed. CBS, 1989.
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