Longbaum, R. (1970). The modern Spirit. Chatto & Windus.
Lua i Stíl Chicago (17ú heag.)Longbaum, Robert. The Modern Spirit. London: Chatto & Windus, 1970.
Lua MLA (9ú heag.)Longbaum, Robert. The Modern Spirit. Chatto & Windus, 1970.
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