Lua APA (7ú heag.)

VENTRELLA.S.W. (2001). THE POWER OF POSITIVE THINKING. VERMILION.

Lua i Stíl Chicago (17ú heag.)

VENTRELLA.S.W. THE POWER OF POSITIVE THINKING. LONDON: VERMILION, 2001.

Lua MLA (9ú heag.)

VENTRELLA.S.W. THE POWER OF POSITIVE THINKING. VERMILION, 2001.

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