Lua APA (7ú heag.)

Vincent. (1980). The Power of Positive Thinking Peale, Norman. Harvard Business Review.

Lua i Stíl Chicago (17ú heag.)

Vincent. The Power of Positive Thinking Peale, Norman. Boston: Harvard Business Review, 1980.

Lua MLA (9ú heag.)

Vincent. The Power of Positive Thinking Peale, Norman. Harvard Business Review, 1980.

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